audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Brake servo/brake master cylinder - left-hand drive vehicles > < Bleeding brake system using brake filling and bleeding equipmentVAS 5234 with adapterVAS 5234/1A
Bleeding brake system without brake filling and bleeding equipment
Bleeding brake system without brake filling and bleeding equipment
  Note
Make sure brake fluid reservoir is always full.
–  Detach protective cap at bleeder screw of brake caliper and attach bleed hose of bleeder bottle to bleeder screw.
Bleeding sequence
1 - Front left-side brake caliper
2 - Front right-side brake caliper
3 - Rear left-side brake caliper
4 - Rear right-side brake caliper
–  Build up pressure in brake system by pumping brake pedal.
  Note
Press brake pedal slowly to avoid formation of bubbles.
–  Once pressure has built up, keep brake pedal depressed.
–  Open bleeder screw with hose of bleeder bottle attached until pressure has dissipated (pedal sags).
–  Keep pedal depressed and close bleeder screw.
–  Release brake pedal and wait approx. 2 seconds to allow brake fluid to flow in from brake fluid reservoir.
–  Repeat procedure until emerging brake fluid is clear and free from bubbles.
–  Tighten bleeder screw to 10 Nm, detach bleeder hose and attach protective cap to bleeder screw.
–  Repeat bleeding procedure in stated sequence at other brake calipers.
–  Making allowance for pad wear, fill brake fluid reservoir as far as max. marking and screw on cap.
–  Start engine and check both brake pedal travel and pressure.
–  In the event of excessive pedal travel, check brake system for leaks and/or repeat bleeding procedure.
Changing brake fluid
→ Booklet808
   

Brake servo/brake master cylinder - left-hand drive vehicles > < Bleeding brake system using brake filling and bleeding equipmentVAS 5234 with adapterVAS 5234/1A