Front brakes
Brake pads
Since August 1988 (production date code "JE") in Ford Sierra vehicles with diesel engines, the material of the brake pads has been changed. In addition, the thickness of the brake disc flange has been increased from 7 to 8.5 mm, and the thickness of the knuckle flange from 8 to 9 mm.
Installing new type front brake discs in old type steering knuckles
Be sure to check the length of the wheel studs. If it is 36.5 mm, then they must be replaced with studs 40 mm long (wheel nuts must be installed at the appropriate thread length).
Brake disk
Beat check (dial gauge measurement)
Maximum beating of the steering knuckle: 0.08 mm.
Maximum disc runout: 0.08 mm.
Brake drive system
Vacuum pump
Since 1987, Ford Sierra vehicles with diesel engines have been equipped with a new type of vacuum pump mounted on the same bracket. It cannot be deflected when adjusting the drive belt tension.
Installing the vacuum pump drive belt
1. Loosen the bolts securing the vacuum pump to the bracket and the bracket bolts securing it to the engine.
2. Remove the mounting bolt from the bracket and move the vacuum pump.
3. Remove pump drive belt.
4. Install a new belt. Insert removed bolt and tighten all vacuum pump mounting bolts.
Brake hoses
During maintenance of the brake system, the condition of the brake hoses should be checked (along the entire length).
Attention! When lifting the car from below, the suspension elements are lowered excessively, which causes the elastic brake hoses to be pulled out of the mounts. Brake hoses should be carefully checked and installed in their places of attachment.
Anti-lock braking system
Since February 1988 (production date code "JR") the ground wire of the ABS pump is connected directly to the negative terminal of the battery.
Further information regarding the technical characteristics, adjustment and repair of the brake system is given in section 10.
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