Fig. 9.12. Brake pipes of the pressure regulation valve in the brake system (pickup models) - top view
1. To the right rear brake; 2. To the left rear brake; 3. From the master cylinder (primary circuit); 4. From the master cylinder (secondary circuit).
Note: Before you begin, see Note, given at the beginning Chapters 9.
Note: If the valve is suspected of being faulty, first have your Skoda dealer check its adjustment (see previous chapter).
Removal
1. Minimize fluid loss by removing the master cylinder reservoir cap and re-tightening it with a piece of polyethylene placed under the cap (do not damage the level sensor). This will create a tight seal and prevent fluid spillage. Alternatively, cap each metal brake pipe immediately after separating it from the valve (see Chapter 10). In addition, it is necessary to seal the holes of the valve itself; work very carefully to prevent foreign particles from entering the system.
2. Loosen the connecting nuts of the metal brake pipes; mark the connections carefully before separating any of the tubes. Unscrew the valve mounting bolts and unhook its spring from the rear suspension torsion beam.
3. Loosen the union nuts and separate the brake pipes from the valve. Try to minimize fluid loss and wash any spilled fluid off the adjacent components as soon as possible. Remove the valve.
Bulkhead
4. Do not attempt to disassemble or "repair" this component; replace it if it is faulty.
Installation
5. Install in the reverse order of removal, paying attention to the following:
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- a) Tighten the couplings securely, then tighten the valve mounting bolts to the specified torque Specifications.
- b) Attach the valve spring to the rear suspension torsion beam. With the vehicle parked on a level surface and loaded to its rated weight, (75 kg on the driver's seat), make sure that the length of spring "A" (Fig. 9.13) is 105.00±0.05 mm. If adjustment is necessary, loosen the lock nut and turn the adjusting nut in the desired direction until the correct spring tension is achieved (see photo). Then swing the rear suspension and check the spring length again. Securely tighten the lock nut.
- c) Bleed the system (see Chapter 9). Check the valve/tube connections for leaks.
- d) Check the operation of the rear brakes. If there is any doubt, have the valve adjustment checked by a Skoda dealer.
Fig. 9.13. Tension of the spring of the pressure adjustment valve in the brake system (pickup models)
1. Valve; 2. Adjusting nut; 3. Lock nut A 105.00±0.05 mm; 4. Spring; 5. Torsion beam rear suspension.