Question 1

What should you know about the Brake Master Cylinder before starting work on the hydraulic fluid and master cylinder on Volvo S40?

Accepted Answer

Before engaging in work, know the dangers of hydraulic fluid. Overhaul of master cylinder is not possible and internal components are not available separately and if any fault occurs the unit has to be renewed. Begin by disconnecting the battery negative lead and then depression of the brake pedal should be repeated repeatedly to collapse any residual vacuum in the servo and siphon as much fluid as possible from the master cylinder reservoir using a syringe or old poultry baster, being careful not to siphon through the mouth as it is poisonous. Disconnect any wiring connectors from the reservoir/master cylinder, and manual transmission models, disconnect the clutch master cylinder fluid hose from the side of the reservoir, being prepared for fluid spillage and plugging the open ends. Next, disconnect the hydraulic pipe unions from the master cylinder, again being prepared for spillage of fluid and plugging off or capping the opening to prevent contamination to anyone. Remove the nuts holding the master cylinder to the servo, pull it off the servo studs being careful not to spill hydraulic fluid on the paintwork. If required, undo the screw and lift the reservoir from the master cylinder body checking the condition of the two seals and renewing if necessary. For refitting, lubricate the seals with clean brake fluid if they are removed, install the reservoir back to the master cylinder and tighten the retaining screw securely. Adjust the master cylinder into position in the servo unit and tighten the tightening nuts according to the indicated torque. Refit the brake pipes without doing up the union nuts entirely at this point but reattach the fluid hose to the reservoir lubricating the hose end with brake hydraulic fluid for easier fitting. Reconnect reservoir/master cylinder electrical connectors, absorbent rags under brake pipe unions on master cylinder, filled reservoir with clean hydraulic fluid specified type. Tighten the brake pipe unions securely if hydraulic fluid is found to leak out and then bleed the hydraulic system, including the clutch hydraulic system for manual transmission models. After bleeding, pressure test the master cylinder by depressing the brake pedal hard and holding it down for 30 seconds, and then release the pedal and check for leaks around the master cylinder pipe unions.

Question 2

What should you know about the Brake Master Cylinder before starting work on the hydraulic fluid and master cylinder on Volvo V70?

Accepted Answer

Before you begin work be aware of the hazards of hydraulic fluid. Overhaul of the master cylinder is not possible, and the internal components are not available in separation, if it is fault, the unit must be renewed. Start by disconnecting the battery negative lead. Depress the brake pedal several times to collapse any remaining vacuum of air in the servo, then siphon as much fluid as possible from the master cylinder reservoir with a hydrometer or old poultry baster, not to siphon by mouth as it is poisonous. Then undo the fasteners and disconnect the engine cross-stay from between the brackets on the front suspension turrets, then disconnect any wiring connectors from the reservoir/master cylinder. For manual transmission models, release the spring clip and disconnect the clutch master cylinder fluid hose from the side of the reservoir being ready for fluid spillage and plugging the open ends. Disconnect the hydraulic pipe unions from the master cylinder, capping the open unions to keep out dirt. Undo the retaining nut and pull out the heat shield from the master cylinder mounting studs then release the nuts holding the master cylinder in position to the servo, you now have to throw out the O-ring seal being careful not to get hydraulic fluid on the paintwork. If necessary, undo the screw and lift the reservoir from the master cylinder body, discarding the two seals. For refitting, if the reservoir was removed, put it back on the master cylinder with new seals and tighten the retaining screw securely. Put the master with the new seal into place on the servo unit and fix it with the nuts tightened to the specified torque. Refit heat shield and holding nut and reattach brake pipes (do not fully tighten union nuts at this stage) Refit the fluid hose to the reservoir, lubricating the hose end with brake hydraulic fluid to assist fitting and reconnect the reservoir/master cylinder electrical connectors. Place absorbent rags under the brake pipe unions on the master cylinder then refill the reservoir with clean hydraulic fluid of the correct type. Tighten the brake pipe unions securely when hydraulic fluid can be seen seeping out and bleed the hydraulic system when you are finished (for manual transmission models, the clutch hydraulic system should also be bled). After bleeding, pressure test the master cylinder by depressing the brake pedal hard and holding it down for 30 seconds, release the brake pedal and check for leaks around the master cylinder pipe unions.

Genuine Volvo Brake Master Cylinder

13 Brake Master Cylinders found

Volvo Master Cylinder Part Number: 9157737

Volvo Master Cylinder Part Number: 9157885

Volvo Master Cylinder Part Number: 36012525

Volvo Master Cylinder Part Number: 36012641

Volvo Master Cylinder Part Number: 36012755

Volvo Master Cylinder Part Number: 36012757

Volvo Master Cylinder Part Number: 36012511

Volvo Master Cylinder Part Number: 36002374

Volvo Master Cylinder Part Number: 36002376

Volvo Master Cylinder Part Number: 36002450

Volvo Master Cylinder Part Number: 36010082

Volvo Master Cylinder Part Number: 36001340

Volvo Master Cylinder Part Number: 8602366

Volvo Brake Master Cylinder Parts and Q&A

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