Models With ABS/ASC + T

NOTE:
Conform with filling and bleeding procedures when replacing or repairing the:
- Tandem-brake master cylinder
- Hydraulic unit ABS/ASC+T
- Accumulator ASC+T
- Components which are installed between the above units.
The procedures of "Bleeding brakes with ABS", are also applicable for ASC+T vehicles when performing other jobs on the braking system (e.g. replacing brake calipers).

CAUTION: Refer to General Data. Description and Operation

Procedure





1. Connect bleeder on expansion tank

NOTE:
- Check relevant Owner's Manual for each device.
- Charging pressure should not exceed 2 bar.

2. Bleed braking system in advance





- Connect bleeder hose with bottle to rear-right brake caliper.
- Open breather valve and flush brake system, flush volume approx. 50 cm3 (brake fluid must emerge without bubbles).
- Close bleeder valve.
- Bleed brakes in the same manner at left rear, right front and left front.
3. Bleed hydraulic unit ABS/ASC+T
- Connect BMW Service Tester to vehicle diagnosis connector.
- Select number 50 "Teves Slip Control System" from control-unit overview, followed by number 5 "Special Functions" from the menu and finally number 1 "Bleeding Routine for ASC+T".
4. Bleed braking system
- Connect bleeder hose with bottle to rear-right brake caliper.
- Open bleeder valve and flush braking system while operating brake pedal as far as it will go at least 10 times (escaping brake fluid must be free of air bubbles)
- Keep brake pedal pressed down, close bleeder valve and release brake pedal.
- Bleed brakes in the same manner at left rear, right front and left front.
- Installation:
Use dust caps on bleeder valves.
5. Bleed accumulator ASC+T (only vehicles up to 09.93)





- Remove liner from inside of front-left wheel house.





- Connect bleeder hose with bottle to bleeder valve (accumulator).

CAUTION: Pressure in accumulator will be approximately 120 bar.

- Carefully open bleeder valve.
- Start bleeding routine in selected menu item of special functions (BMW Service Tester) and flush accumulator until escaping brake fluid is free of air bubbles.
- If necessary, repeat bleeding routine several times.
- Close bleeder valve.
- Install dust cap.
- Install liner on inside of wheel house.
6. Remove bleeder
- Check and, if necessary, correct brake-fluid level.





- Screw cap on expansion tank (ensure that rubber seal (1) is installed in cap).