Clutch Control 412-1

412 Clutch Control General . .................... . ....... 412-1 To replace clutch master cylinder .......... 412-1

GENERAL

The clutch master cylinder and slave cylinder can be ser­viced without removing the engine or transmission. However, the clutch slave cylinder can only be removed together with the pressure plate assembly, clutch disc, and release bearing. See 411 Clutch for information on removing these compo­nents.

The clutch is non-adjustable. Typical problems with the clutch hydraulic system are fluid leaks, and air trapped in the system that creates a spongy feel to the clutch pedal. Fluid leaks are usually apparent around the component. Internal leakage past a seal can occur which results in a loss of pres­sure when the pedal is pushed.

To replace clutch master cylinder

1. Working in the engine compartment, pinch off the fluid supply hose from the brake fluid reservoir to the clutch master cylinder. See Fig. 1.

Ag. 1. Ruid reservoir B for clutch master cylinder and master cyl­inder A. Arrow shows fluid supply hose.

2. Remove the hydraulic pipe from the master cylinder. See Fig. 2. Remove the clip that holds the pipe to the body.

CAUTION Brake fluid can damage paint and bodywork. Immediately rinse any spills with water.

To bleed clutch master and slave cylinders ... 412-2

NOTE On cars equipped with ABS, it may be necessary to remove the alternator belt tensioner and move the alternator to one side to reach the master cylinder.

Fig. 2. Clutch master cylinder hydraulic pipe being removed. Master cylinder is located at A.

3. Inside the car, remove the left hand footwell air duct. See Fig. 3. Remove the clevis pin and the master cyl­inder self-locking mounting nuts. See Fig. 4.

WARNING Always replace self-locking nuts with new ones.

4. Installation is the reverse of removal. Bleed the system as described below. Replenish the fluid in the brake master cylinder reservoir as necessary.

NOTE Do not allow the reservoir to empty, otherwise the entire sys­tem will need to be bled after the reservoir is refilled.

GENERAL

412-2 CI utch Control

Fig. 3. Left hand footwell air duct being re­moved .

Fig. 4. Clevis pin (arrow) and clutch master cylinder self-locking nuts A to be removed. Master cylinder is removed from engine compartment.

To bleed clutch master and slave cylinders

Tool required

• cooling system pressure tester with cap or equivalent

Bleeding the clutch master cylinder requires that the brake fluid reservoir be pressurized using special equipment. Saab

GENERAL

recommends using a coolant system pressure tester and an adaptor that screws onto the brake fluid reservoir. A brake system pressure bleeding kit can also be used for this proce­dure. These tools and kits are available from automotive tool manufacturers and supply stores.

1. Place a 6 mm. (1/4 in.) inside diameter hose on the slave cylinder bleeder nipple. See Fig. 5. Put the other end of the hose in a container.

87126·S4l1516

Fig. 5. Slave cylinder bleeder nipple (arrow).

2. Fill the master cylinder reservoir with brake fluid. Place the cooling system pressure tester on the mas­ter cylinder.

3. Open the bleeder nipple 1/2 of a turn.

4. Slowly pump up the tester only once or twice until fluid flows out of hose. Allow the fluid to flow until it is free of bubbles.

CAUTION

Too much pressure applied to the system will damage the seals.

5. Shut off the bleeder nipple, recheck the fluid level and check the clutch pedal operation.

NOTE

Do not allow the reservoir to empty, otherwise the entire sys­tem will need to be bled after the reservoir is refilled.