Opel 1900 1973 Service Manual page 272

Condition
Brake Roughness or Chatter
(Pedal Pulsates)
Pedal Effort
Possible Cause
2. Front end out of line.
3. Unmatched tires on same
axle.
4. Restricted brake tubes
or hoses.
5. Malfunctioning caliper
assembly.
6. Defective or damaged
shoe and lining (grease or
brake fluid on lining or
bent shoe).
7. Malfunctioning rear
brakes.
8. Loose suspension parts.
9. Loose calipers.
2. Parallelism not within
specifications.
3. Wheel bearings not
adjusted.
4. Rear drums out of round.
5. Shoe reversed (steel
against iron).
1. Malfunctioning power
brake.
DISC BRAKES
Correction
2. Check and align to manufac-
turer's specifications.
3. Tires with approximately the
same amount of tread should be
on the same axle.
4. Check for soft hoses and damaged
lines. Replace with new hoses and
new double-walled steel brake
tubing.
5. Frozen caliper - check for
stuck or sluggish pistons, proper
lubrication.
6. Install new shoe and lining in
complete axle sets.
7. Check for brake adjustment,
defective lining (grease or brake
fluid on lining) or defective wheel
cylinders. Repair as necessary.
8. Check all suspension mountings.
9. Check and torque bolts to
specifications.
1. Check per instructions and
replace or machine the rotor, if not
within specifications.
2. Check per instructions and replace
or machine the rotor, if not within
specifications.
3. Adjust wheel bearings to correct
specifications.
4. Check and, if not within
specifications, turn the drums within
specifications.
5. Replace shoe and lining and
machine rotor within specifications.
1. Check power brake and repair,
if necessary.
used