thanks for that Davren 
General Brake Bleed Procedure
- Thread starter jeremys8
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General Brake Bleed Procedure
the Bosch 5.7 ABS system with 12 solenoid valves and four hydraulic brake circuits. The ABS system uses an electric pump to pressurise brake fluid to the circuits.
Each of the hydraulic circuits is controlled by a load valve, normally open, and a drain valve, normally closed. When the ECU detects one wheel decelerating at a rate much greater than the others, the ECU closes the load valve and opens the drain valve for that wheel to bleed off hydraulic pressure and prevent lockup. Once the imbalance is corrected and the wheel is decelerating at roughly the same rate as the others, pressure must be reapplied to the brake caliper to help stop the car. This is accomplished by closing the drain valve and opening the load valve.
5. Pump the brake pedal (approximately ten times) and hold with enough pressure to keep at equal to or above 15 bar (you can check the brake pedal pressure via ABS Parameters in MES) = basically hold pedal down enough to stop the wheels from spinning - do not put too much pressure on so that during the execute stage the pedal goes to the floor. Hold until #8 is complete
6. Tell your helper to crack the bleed valve and immediately (goto 7)
7. From MES (I connected to Bosch ABS 5.7 VDC on my 147 GTA) Execute the RR drain valve - the pedal will drop during the tick tick tick tick - then holds position, until - tick tick tick tick - and pedal drops again (don't let it hit the floor - if it does you are pushing too hard and must restart)
Each of the hydraulic circuits is controlled by a load valve, normally open, and a drain valve, normally closed. When the ECU detects one wheel decelerating at a rate much greater than the others, the ECU closes the load valve and opens the drain valve for that wheel to bleed off hydraulic pressure and prevent lockup. Once the imbalance is corrected and the wheel is decelerating at roughly the same rate as the others, pressure must be reapplied to the brake caliper to help stop the car. This is accomplished by closing the drain valve and opening the load valve.
5. Pump the brake pedal (approximately ten times) and hold with enough pressure to keep at equal to or above 15 bar (you can check the brake pedal pressure via ABS Parameters in MES) = basically hold pedal down enough to stop the wheels from spinning - do not put too much pressure on so that during the execute stage the pedal goes to the floor. Hold until #8 is complete
6. Tell your helper to crack the bleed valve and immediately (goto 7)
7. From MES (I connected to Bosch ABS 5.7 VDC on my 147 GTA) Execute the RR drain valve - the pedal will drop during the tick tick tick tick - then holds position, until - tick tick tick tick - and pedal drops again (don't let it hit the floor - if it does you are pushing too hard and must restart)
