34 10 014 Adjusting handbrake
Special tools required:
- 34 6 306
- 34 6 307
- 34 6 308
- 34 6 309
Perform inspection in the following manner:
When 1st ratchet is engaged, no braking force should be exerted.
The difference in wheel circumferential forces between the left and right wheels may deviate by max. 30 % from the greater value (measured on brake analyzer).
In event of larger deviations of wheel circumferential force: readjust handbrake .
Braking with locked wheels must be possible with the handbrake.
The handbrake must be readjusted if the actuation stroke is greater than 6 teeth.
Basic handbrake adjustment is necessary:
- In event of excessive actuation stroke (6 teeth).
- When replacing parking brake Bowden cables
- When replacing handbrake lever.
Setting instruction for parking brake Bowden cables
Release gaiter (1) of parking brake lever from clip.
Release self-locking nut (2) until the load on the Bowden cable has been relieved completely.
Screw in adjusting nut on handbrake lever until a gap (A) of 0.5- 1.5 mm between handbrake actuating lever (2) and stop (1) is set at brake calipers.
- Release adjusting nut on handbrake lever completely.
- Adjust adjusting nut on handbrake lever as shown above.
- Apply handbrake lever three times.
- Press brake pedal to floor at least three times so that air gap can be set.
- Carry out function check
Checking adjustment on brake test stand
0th tooth (handbrake released): Vehicles with manual transmission: Shift lever in neutral position.
Vehicles with automatic transmission: Selector lever in "N" position wheel circumferential force ≤ 100 N.
1st tooth: No increase in braking force with regard to 0th tooth. Indicator light may light up.
2nd tooth: An increase in braking force must take place. Indicator light must be lit.
3rd tooth: Increase in braking force.
4th tooth: Wheel circumferential force per wheel: 700 N to 1300 N.
(Must be achieved in the 4th tooth at the latest)