Bleeding brake system using brake filling and bleeding equipment VAS 5234 — VW

Bleeding brake system using
brake filling and bleeding equipment
VAS 5234
Special tools and workshop equipment required
Brake filling and bleeding equipment
VAS 5234
Tool set for brake bleeding
VAS 6564
WARNING
Only use brake fluid that is in accordance with the VW standard
Electronic Parts Catalogue
.
Note
If, in vehicles with EDL, EDL/TCS or EDL/TCS/ESP, a chamber in brake fluid reservoir is completely empty (e.g. brake system leaking), brake system must be pre-bled first.
Pre-bleeding
Note
Not possible in vehicles with Mark 70 ABS (ABS/TCS only).
Connect
brake filling and bleeding equipment
VAS 5234
or
V.A.G 1869
.
Bleeding sequence:
1 - Bleed front left and front right brake calipers simultaneously.
2 - Bleed rear left and rear right brake calipers simultaneously.
Leave bleeder valves open with brake fluid hoses connected until brake fluid free from air bubbles flows out.
Then bleed hydraulic unit again using
vehicle diagnostic tester
.
Vehicle diagnostic tester
Basic setting
.
Initiate basic setting (to bleed brake system):
Connect
vehicle diagnostic tester
and select function
Chapter
.
Bleed brake system as normal.
Vehicle diagnostic tester
Basic setting
.
Bleeding (normal)
Note
Adhere strictly to work sequence when bleeding brake system.
Connect
brake filling and bleeding equipment
VAS 5234
or
V.A.G 1869
.
Open bleeder valves in specified order and bleed brake calipers.
1 - Front left brake caliper
2 - Front right brake caliper
3 - Rear left brake caliper
4 - Rear right brake caliper
Note
Use suitable bleeder hose. It must sit tightly on bleeder valve so that no air can enter brake system.
Leave bleeder valve of each brake caliper open with bleeder hose fitted until brake fluid discharges free of air bubbles.
Subsequent bleeding
Carry out subsequent bleeding when:
brake pedal travel is too long or so-called
»soft brake pedal«
This requires the assistance of a second mechanic:
Depress brake pedal firmly and hold.
Open bleeder valve on brake caliper.
Fully depress brake pedal.
Close bleeder valve with pedal held down.
Release brake pedal slowly.
Note
This bleed sequence must be carried out 5 times per brake caliper.
Bleeding sequence:
1 - Front left brake caliper
2 - Front right brake caliper
3 - Rear left brake caliper
4 - Rear right brake caliper
Note
A road test must be carried out after the brakes have been bled. When doing this an ABS regulation must be carried out at least once!