Brake Fluid, Changing Using A Bleeding Unit
Brake fluid, changing using a bleeding unit
Special tools:
115 8147 TORQUE SOCKET 1/2" 19 MM 115 8147 Torque Socket 1/2" 19 mm
999 2809 PRESS TOOL 999 2809 Press Tool
Guidelines for changing
It is recommended that brake fluid is changed every other year. On cars that are exposed to heavy and frequent braking, for example, mountain driving or driving in tropical climates with high humidity, the brake fluid must be changed every year.
Background
The brake fluid is hydroscopic, i.e. the fluid absorbs water molecules from the air. This occurs via the brake hoses and the brake fluid reservoir, which are made of rubber and plastic, and is not impervious to water molecules.
High water content lowers the brake fluid's boiling point greatly, and causes corrosion in the brake system. This damages the brake system, and reduces its function considerably.
Note! Use only Volvo Genuine Parts brake fluid (Volvo DOT 4+). Never reuse brake fluid. Always keep brake fluid in original pack and well sealed.
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Preparations
Ignition off
- Raise the car and remove the wheels.
- Clean the filler cap for the brake fluid reservoir.
- Remove the filler cap.
- Use a collecting bottle with a hose to collect the brake fluid.
- Set the bleeding unit to 0.2-0.3 MPa.
Connecting the bleeding unit
- Connect the bleeding unit to the brake fluid reservoir.
Follow the manufacturer's instructions for connecting and use of the unit.
Changing the brake fluid, left front
Remove:
- the protective cap from the bleed nipple on the front left brake caliper.
Connect the collecting bottle hose.
Open the nipple approximately one turn.
- Press the brake caliper piston at the bottom of the caliper using a G-clamp. Leave the G-clamp in pushed in position.
- Pressurize the braking system with the bleed unit. Drain 2-3 dl of brake fluid.
- Close the bleed nipple and remove the hose.
- Install the protective cap.
- Depressurize the braking system using the bleeding unit.
- Remove the G-clamp from the brake caliper.
- Depress the brake pedal several times.
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Changing the brake fluid, right front
- Repeat the procedure, according to points, on the right front brake caliper. Then continue with the following instructions.
Removing the brake pads, left rear
Remove:
- the brake pads from the brake caliper.
Changing the brake fluid, left rear
- Remove the protective cap from the bleed nipple.
- Connect the collecting bottle hose.
- Open the nipple approximately one turn.
- Press in the caliper's pistons in the bottom of the caliper. Use tool 999 2809 PRESS TOOL 999 2809 Press Tool (2 x). Leave the tools on the caliper.
- Pressurize the braking system with the bleed unit.
- Drain 2-3 dl of brake fluid.
- Close the bleed nipple and remove the hose.
- Install the protective cap.
- Depressurize the braking system using the bleed unit.
- Remove the tools from the brake caliper.
Installing the brake pads, rear
- Install the brake pads.
- Depress the brake pedal several times.
Changing the brake fluid, right rear
- Repeat the procedure, according to points, on the right rear brake caliper.
Removing the bleed unit
Remove:
- The bleed unit's connection from the brake fluid reservoir.
Finishing work
- Depress the brake pedal repeatedly until the brake pistons are in the normal position.
- Check the brake fluid level and install the reservoir cover.
Clean up any spilled brake fluid using a warm water and car shampoo.
Fitting the wheel
Ensure that the mating surfaces on the brake discs and rims are clean.
- Lubricate the centering lug on the hub for the rims with rustproofing agent, 116 1038-3.
Install:
- The wheel.
- Install the screws lightly. Then tighten them crosswise to 110 Nm . When tightening using an impact wrench, use torque socket 115 8147 TORQUE SOCKET 1/2" 19 MM 115 8147 Torque Socket 1/2" 19 mm.
Note! Crosswise tightening and torque tightening is important to prevent stresses in the brake disc.