Brake Fluid, Replacement Without Bleeding Unit [DDDD]
DDDD. Brake fluid, replacement without bleeding unitSpecial tools: 115 8147, 999 2809
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Replacement guidelines
Replacing brake fluid is recommended every 48,000 km (30,000 miles), or every other year. In cars where the brakes are used and often (e.g. in hilly areas or in tropical climates where humidity levels are high), fluid should be relaced each year.
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Background
The reason that brake fluid should be changed is that brake fluid is hygroscopic: that is, it absorbs water molecules from the air. Water is partly absorbed through the brake hoses and brake fluid reservoir, which are made of rubber and plastic respectively, and are to some extent permeable to water molecules. Increasing the water content of brake fluid means that the brake fluid's boiling point falls dramatically and that corrosion forms on the braking system components.The result is that the braking is damaged and its functioning seriously impaired.
Note! Use only Volvo original brake fluid marked DOT 4+. Never re-use brake fluid. Always keep brake fluid in its original packing, well sealed.
Note! Check continuously that there is enough brake fluid in the brake fluid reservoir when replacing brake fluid.
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Preparations
- Ignition off.
- Jack car up and remove wheels.
- Clean around brake fluid reservoir cap. Get a drain bottle and hose to collect brake fluid in.
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Replacing brake fluid, front
- Remove protective cap from bleed nipple.
- Connect drain bottle hose. Open nipple approx. one turn.
- Push brake caliper piston to bottom of caliper using a bolt clamp, see illustration.Leave bolt clamp in the pushed-in position.
- Push brake pedal right down and hold it there for approx. 2 seconds before releasing it. Repeat until 2 - 3 dl (0.2 - 0.3 US qt) of brake fluid has drained off.
- Close bleed nipple while holding brake pedal right down.
- Remove hose and re-fit protective cap.
- Remove bolt clamp from brake caliper.
- Depress brake pedal a few times.
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Replacing brake fluid RH front
- Repeat steps [DDDD2 - DDDD4], on the front RH brake caliper.
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Removing brake pad LH rear
- Remove brake pad brake caliper.
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Replacing brake fluid LH rear
- Remove protective cap from bleed nipple.
- Connect drain bottle hose. Open nipple approx. one turn.
- Push brake caliper pistons right down into caliper, using tools 999 2809 (x 2). Leave tools on calipers.
- Push brake pedal right down and hold it there for approx. 2 seconds before releasing it. Repeat this until 2 - 3 dl brake fluid has drained off
- Close bleed nipple while holding brake pedal right down.
- Remove hose and re-fit protective cap.
Remove:
- Remove tools from brake caliper.
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Removing brake pad LH rear
Install brake pad.
- Depress brake pedal a few times.
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Replacing brake fluid RH, rear
Repeat steps
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Finishing work
- Depress brake pedal repeatedly until brake pistons return to normal position.
- Check brake fluid level and install reservoir cap.
Clean off any brake fluid spillage with lukewarm water and car-wash shampoo.
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Installing wheels
Make sure that brake disc and rim contact surfaces are clean.
- Grease hub center rim guide with anti-rust agent 116 1038-3.
- Re-fit wheel.
- Tighten nuts hand tight. Then tighten in a star pattern to 110 Nm. If tightening with a nut wrench, use torque bracket
Note! Tightening nuts in a star pattern to a specified torque is important to prevent stresses arising in the brake disc.