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Linings Trouble Tracers

LINING SURFACE TAPERED

DEEP IRREGULAR CIRCUMFERENTIAL GROOVES

GROOVED LINING SURFACE

CRACKS AROUND RIVET HOLES

STEPS IN THE LINING SURFACE

UNEVEN LINING SURFACE

SCARRED LINING SURFACE

GREASY LINING SURFACE

CIRCUMFERENTIAL GROOVES

LARGE FRACTURES IN LINING SURFACE

BURNT LINING SURFACE

DIRT ON THE LINING SURFACE

BUILD UP OF DIRT BETWEEN LINING ANDBRAKE SHOE

SURFACE CRAZING

POOR BEDDING-IN 1

POOR BEDDING-IN 2

POOR BEDDING-IN 3

LINING SURFACE TAPERED

lining-surface-tapered
MAIN REASONS
  • Brake shoes misaligned with the brake drum
  • Distorted brake shoe or brake drum turned on taper
POSSIBLE EFFECTS
  • The linings may lock on to the drum when braking from high speeds
  • Vehicle pull and excessive brake noise may occur
SOLUTION

Replace or grind/machine drum. Replace brake shoe anchor pins or parts that locate brake shoes 

DEEP IRREGULAR CIRCUMFERENTIAL GROOVES

deep-irregular-circumferential-grooves
MAIN REASONS
  • Large particles loose in the brake
  • Very poor drum condition and maintenance
POSSIBLE EFFECTS
  • Very high lining and drum wear
  • Squeal
SOLUTION

Avoid contamination. Replace linings and grind or replace drum as appropriate

GROOVED LINING SURFACE

grooved-lining-surface
MAIN REASONS
  • Too heavy riveting force
  • Wrong shape of rivet heads
  • Brake shoe radius does not conform to lining radius
  • Brake shoe platform is not clean or even
POSSIBLE EFFECTS
  • Lining and drum breakage
  • Brake over-heating
  • Noise
SOLUTION

Replace linings, and avoid excessive pressure during riveting operations

CRACKS AROUND RIVET HOLES

cracks-around-rivet-holes
MAIN REASONS
  • Too heavy riveting force
  • Wrong shape of rivet heads
  • Brake shoe radius does not conform to lining radius
  • Brake shoe platform is not clean or even
POSSIBLE EFFECTS
  • Lining and drum breakage
  • Brake over-heating
  • Noise
SOLUTION

Replace linings, and avoid excessive pressure during riveting operations

STEPS IN THE LINING SURFACE

steps-in-the-lining-surface
MAIN REASONS
  • There may be a step in the brake drum surface
  • General drum wear
POSSIBLE EFFECTS
  • Rapid lining wear
  • If the wear pattern diff ers across the axle, vehicle pull and excessive noise can result
SOLUTION

Grind/Machine drum surface or renew (a drum grind may incur oversize lining fi tment)

UNEVEN LINING SURFACE

trouble-tracers-cv-surfacecracks
MAIN REASONS
  • Wrongly adjusted or worn axle bearings
POSSIBLE EFFECTS
  • Very high lining and drum wear
  • Squeal
SOLUTION

Replace linings, replace wheel bearing and replace or grind drum as appropriate

SCARRED LINING SURFACE

scarred-lining-surface
MAIN REASONS
  • Poor drum condition,e.g. heat crazing
POSSIBLE EFFECTS
  • Rapid lining wear
  • If linings not 100% bedded-in, low brake effi ciency can result
SOLUTION

Replace linings and avoid overheating brake

GREASY LINING SURFACE

greasy-lining-surface
MAIN REASONS
  • Broken or improperly mounted hub oil seals
  • Excessive lubrication of the bearings of the braking mechanism
POSSIBLE EFFECTS
  • Vehicle pull may occur if the problem is only found at one side of the axle
  • Low deceleration
SOLUTION

Remove grease from the linings, cure oil/grease leaks

CIRCUMFERENTIAL GROOVES

circumgerential-grooves
MAIN REASONS
  • Poor drum condition
  • Improper preparation with a wire brush, shoe grinder or similar
POSSIBLE EFFECTS
  • Vehicle pull may occur if there is a diff erent wear pattern on the opposite axle end
  • Insufficient deceleration and excessive noise
SOLUTION

Replace linings and grind or replace drum as appropriate

LARGE FRACTURES IN LINING SURFACE

large-fractures-lining-surface
MAIN REASONS
  • Faults in brake mechanism
  • Sticking brake shoes (weak return springs)
  • Excessive use of brakes at high speed
  • Overloaded vehicle
  • Too large air chambers
POSSIBLE EFFECTS
  • High lining wear
  • Vehicle pull and excessive brake noise
  • Disintegration of lining
  • Low deceleration
SOLUTION

Replace linings, avoid overworking brakes and ensure brake components are correct and are in good condition

BackBack to Trouble Tracers

BURNT LINING SURFACE

burnt-lining-surface
MAIN REASONS
  • Faults in brake mechanism
  • Sticking brake shoes (weak return springs)
  • Excessive use of brakes from high speed
  • Wrong brake cylinders/air chambers or levers
  • Overloaded vehicle
  • Incorrect brake proportioning between tractor/trailer units
POSSIBLE EFFECTS
  • High lining wear
  • Vehicle pull and excessive brake noise
  • Deceleration too low
SOLUTION

Replace linings, avoid overworking brakes and ensure brake components are correct and are in good condition

DIRT ON THE LINING SURFACE

dirt-on-the-lining-surface
MAIN REASONS
  • Dirt particles in the brake
  • Poor brake maintenance (insuffi cient cleaning)
POSSIBLE EFFECTS
  • High lining and drum wear
  • Poor deceleration
  • Vehicle pull and excessive brake noise may occur
SOLUTION

If heavy contamination, replace linings and ensure contamination-free relining operation

BUILD UP OF DIRT BETWEEN LINING ANDBRAKE SHOE

build-up-of-dirt
MAIN REASONS
  • Shoe radius out of line
  • Shoe platform not blast cleaned and painted properly
  • Shoe platform not parallel
  • Lining riveted incorrectly
POSSIBLE EFFECTS
  • Cracks in the lining material or crack in drum surface
  • Loose linings
  • Squeal
  • Improper cleaning causes rust scale to build up and lift the lining from the shoe
SOLUTION

Replace linings and ensure shoe is clean and free from contamination before lining fi tment

SURFACE CRAZING

surface-crazing
MAIN REASONS
  • Caused by excessive brake temperature, i.e. when brake is cold on motorway then having to perform a sudden stop i.e. off a slip road. Rapid temperature input does not allow for heat soak from material into brake system
POSSIBLE EFFECTS
  • This condition has no eff ect on the integrity or performance of the lining
  • Penetration of the crazing is usually no more than 1mm deep
  • Wear through with normal brake use and has no eff ect on the lining
SOLUTION

Avoid high-speed heavy duty braking from cold

POOR BEDDING-IN 1

poor-bedding
MAIN REASONS
  • Lining radius is larger than actual drum diameter
  • Bedding-in period for the lining was too short
POSSIBLE EFFECTS
  • Vehicle pull and excessive brake noise may occur
  • Low deceleration
SOLUTION

Replace linings and ensure the correct lining radius to drum diameter is selected, or extend bedding-in period

BackBack to Trouble Tracers

POOR BEDDING-IN 2

poor-bedding-in2
MAIN REASONS
  • Drum diameter is larger than lining radius
  • Bedding-in period for the lining was too short
  • Drum wear
POSSIBLE EFFECTS
  • If the wear pattern diff ers across the axle, vehicle pull can result; also excessive brake noise
  • Low deceleration
SOLUTION

Replace linings and ensure the correct lining radius to drum diameter is selected, or extend bedding-in period

BackBack to Trouble Tracers

POOR BEDDING-IN 3

poor-bedding-in3
MAIN REASONS
  • Bedding-in period for the lining was too short
  • Drum wear
POSSIBLE EFFECTS
  • Either low or very high deceleration, with high deceleration the linings may lock on to the drum
  • If the wear pattern diff ers across the axle, vehicle pull and excessive noise can result
SOLUTION

Replace linings and ensure the correct lining radius to drum diameter is selected, or extend bedding-in period

BackBack to Trouble Tracers

LINING SURFACE TAPERED

lining-surface-tapered
MAIN REASONS
  • Brake shoes misaligned with the brake drum
  • Distorted brake shoe or brake drum turned on taper
POSSIBLE EFFECTS
  • The linings may lock on to the drum when braking from high speeds
  • Vehicle pull and excessive brake noise may occur
SOLUTION

Replace or grind/machine drum. Replace brake shoe anchor pins or parts that locate brake shoes 

DEEP IRREGULAR CIRCUMFERENTIAL GROOVES

deep-irregular-circumferential-grooves
MAIN REASONS
  • Large particles loose in the brake
  • Very poor drum condition and maintenance
POSSIBLE EFFECTS
  • Very high lining and drum wear
  • Squeal
SOLUTION

Avoid contamination. Replace linings and grind or replace drum as appropriate

GROOVED LINING SURFACE

grooved-lining-surface
MAIN REASONS
  • Too heavy riveting force
  • Wrong shape of rivet heads
  • Brake shoe radius does not conform to lining radius
  • Brake shoe platform is not clean or even
POSSIBLE EFFECTS
  • Lining and drum breakage
  • Brake over-heating
  • Noise
SOLUTION

Replace linings, and avoid excessive pressure during riveting operations

CRACKS AROUND RIVET HOLES

cracks-around-rivet-holes
MAIN REASONS
  • Too heavy riveting force
  • Wrong shape of rivet heads
  • Brake shoe radius does not conform to lining radius
  • Brake shoe platform is not clean or even
POSSIBLE EFFECTS
  • Lining and drum breakage
  • Brake over-heating
  • Noise
SOLUTION

Replace linings, and avoid excessive pressure during riveting operations

STEPS IN THE LINING SURFACE

steps-in-the-lining-surface
MAIN REASONS
  • There may be a step in the brake drum surface
  • General drum wear
POSSIBLE EFFECTS
  • Rapid lining wear
  • If the wear pattern diff ers across the axle, vehicle pull and excessive noise can result
SOLUTION

Grind/Machine drum surface or renew (a drum grind may incur oversize lining fi tment)

UNEVEN LINING SURFACE

trouble-tracers-cv-surfacecracks
MAIN REASONS
  • Wrongly adjusted or worn axle bearings
POSSIBLE EFFECTS
  • Very high lining and drum wear
  • Squeal
SOLUTION

Replace linings, replace wheel bearing and replace or grind drum as appropriate

SCARRED LINING SURFACE

scarred-lining-surface
MAIN REASONS
  • Poor drum condition,e.g. heat crazing
POSSIBLE EFFECTS
  • Rapid lining wear
  • If linings not 100% bedded-in, low brake effi ciency can result
SOLUTION

Replace linings and avoid overheating brake

GREASY LINING SURFACE

greasy-lining-surface
MAIN REASONS
  • Broken or improperly mounted hub oil seals
  • Excessive lubrication of the bearings of the braking mechanism
POSSIBLE EFFECTS
  • Vehicle pull may occur if the problem is only found at one side of the axle
  • Low deceleration
SOLUTION

Remove grease from the linings, cure oil/grease leaks

CIRCUMFERENTIAL GROOVES

circumgerential-grooves
MAIN REASONS
  • Poor drum condition
  • Improper preparation with a wire brush, shoe grinder or similar
POSSIBLE EFFECTS
  • Vehicle pull may occur if there is a diff erent wear pattern on the opposite axle end
  • Insufficient deceleration and excessive noise
SOLUTION

Replace linings and grind or replace drum as appropriate

LARGE FRACTURES IN LINING SURFACE

large-fractures-lining-surface
MAIN REASONS
  • Faults in brake mechanism
  • Sticking brake shoes (weak return springs)
  • Excessive use of brakes at high speed
  • Overloaded vehicle
  • Too large air chambers
POSSIBLE EFFECTS
  • High lining wear
  • Vehicle pull and excessive brake noise
  • Disintegration of lining
  • Low deceleration
SOLUTION

Replace linings, avoid overworking brakes and ensure brake components are correct and are in good condition

BackBack to Trouble Tracers

BURNT LINING SURFACE

burnt-lining-surface
MAIN REASONS
  • Faults in brake mechanism
  • Sticking brake shoes (weak return springs)
  • Excessive use of brakes from high speed
  • Wrong brake cylinders/air chambers or levers
  • Overloaded vehicle
  • Incorrect brake proportioning between tractor/trailer units
POSSIBLE EFFECTS
  • High lining wear
  • Vehicle pull and excessive brake noise
  • Deceleration too low
SOLUTION

Replace linings, avoid overworking brakes and ensure brake components are correct and are in good condition

DIRT ON THE LINING SURFACE

dirt-on-the-lining-surface
MAIN REASONS
  • Dirt particles in the brake
  • Poor brake maintenance (insuffi cient cleaning)
POSSIBLE EFFECTS
  • High lining and drum wear
  • Poor deceleration
  • Vehicle pull and excessive brake noise may occur
SOLUTION

If heavy contamination, replace linings and ensure contamination-free relining operation

BUILD UP OF DIRT BETWEEN LINING ANDBRAKE SHOE

build-up-of-dirt
MAIN REASONS
  • Shoe radius out of line
  • Shoe platform not blast cleaned and painted properly
  • Shoe platform not parallel
  • Lining riveted incorrectly
POSSIBLE EFFECTS
  • Cracks in the lining material or crack in drum surface
  • Loose linings
  • Squeal
  • Improper cleaning causes rust scale to build up and lift the lining from the shoe
SOLUTION

Replace linings and ensure shoe is clean and free from contamination before lining fi tment

SURFACE CRAZING

surface-crazing
MAIN REASONS
  • Caused by excessive brake temperature, i.e. when brake is cold on motorway then having to perform a sudden stop i.e. off a slip road. Rapid temperature input does not allow for heat soak from material into brake system
POSSIBLE EFFECTS
  • This condition has no eff ect on the integrity or performance of the lining
  • Penetration of the crazing is usually no more than 1mm deep
  • Wear through with normal brake use and has no eff ect on the lining
SOLUTION

Avoid high-speed heavy duty braking from cold

POOR BEDDING-IN 1

poor-bedding
MAIN REASONS
  • Lining radius is larger than actual drum diameter
  • Bedding-in period for the lining was too short
POSSIBLE EFFECTS
  • Vehicle pull and excessive brake noise may occur
  • Low deceleration
SOLUTION

Replace linings and ensure the correct lining radius to drum diameter is selected, or extend bedding-in period

BackBack to Trouble Tracers

POOR BEDDING-IN 2

poor-bedding-in2
MAIN REASONS
  • Drum diameter is larger than lining radius
  • Bedding-in period for the lining was too short
  • Drum wear
POSSIBLE EFFECTS
  • If the wear pattern diff ers across the axle, vehicle pull can result; also excessive brake noise
  • Low deceleration
SOLUTION

Replace linings and ensure the correct lining radius to drum diameter is selected, or extend bedding-in period

BackBack to Trouble Tracers

POOR BEDDING-IN 3

poor-bedding-in3
MAIN REASONS
  • Bedding-in period for the lining was too short
  • Drum wear
POSSIBLE EFFECTS
  • Either low or very high deceleration, with high deceleration the linings may lock on to the drum
  • If the wear pattern diff ers across the axle, vehicle pull and excessive noise can result
SOLUTION

Replace linings and ensure the correct lining radius to drum diameter is selected, or extend bedding-in period

BackBack to Trouble Tracers
Back to All Symptoms
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