Don't like the adverts? Click here to remove them
ebay Brake Booster Pumps.... anyone tried one?
- Thread starter sim303
- Start date
- Joined
- Mar 7, 2010
- Messages
- 2,407
- Country Flag
How are the relays then? Looks like there are two of them.
If the booster motor doesn't stop after 5 min running, the problem would likely be either relay or ABS ECU.
If it does stop after 5 mins, the ECU is working (somewhat at least), but the pressure switch is the prime suspect.
See attached diagnostics procedure with some diagrams.
(The notes next to the relays say only that on some versions, one relay is named "Motor 1 Relay" and the other is named "Motor 2 Relay", while on other version it is the other way around (1 is 2 and 2 is 1))
If the booster motor doesn't stop after 5 min running, the problem would likely be either relay or ABS ECU.
If it does stop after 5 mins, the ECU is working (somewhat at least), but the pressure switch is the prime suspect.
See attached diagnostics procedure with some diagrams.
(The notes next to the relays say only that on some versions, one relay is named "Motor 1 Relay" and the other is named "Motor 2 Relay", while on other version it is the other way around (1 is 2 and 2 is 1))
sim303
Active Member
- Joined
- Jan 31, 2017
- Messages
- 84
- Country Flag
Well, after an untold amount of me$$ing about, it's fixed...
Along the way I accidentally trashed the new piston kit, and the HBB body (didn't realise the new piston had not located in the spring properly...). Ended up buying a used HBB off ebay and making a "Best of" HBB using the best bits from the two units I had (including the new motor, new resevoir etc....)
BUT: The actual problem was this:
I did not know that Techstream does not report Brake codes (so I thought I had no codes). Neither did I know that that doesn't mean there are no codes. Nor that you can read them off the DLC3 connector. When I did this, it was basically reporting every conceivable brake code, including some which I knew I had not messed with (all wheel speed sensors).
Then the light bulb went on...
When I removed the Inlet pipe for a completely unrelated job a while back, I disconnected the HBB loom to ease access, and probably switched on the IGN with it disconnected.
What I didn't realise was that these brake codes do not appear to reset even if the condition clears. You have to do it with the DLC3.
Once I did that, the alarm went off, the pump worked properly, and all is good (on that front if not others) again.
What a palaver.
sim
Along the way I accidentally trashed the new piston kit, and the HBB body (didn't realise the new piston had not located in the spring properly...). Ended up buying a used HBB off ebay and making a "Best of" HBB using the best bits from the two units I had (including the new motor, new resevoir etc....)
BUT: The actual problem was this:
I did not know that Techstream does not report Brake codes (so I thought I had no codes). Neither did I know that that doesn't mean there are no codes. Nor that you can read them off the DLC3 connector. When I did this, it was basically reporting every conceivable brake code, including some which I knew I had not messed with (all wheel speed sensors).
Then the light bulb went on...
When I removed the Inlet pipe for a completely unrelated job a while back, I disconnected the HBB loom to ease access, and probably switched on the IGN with it disconnected.
What I didn't realise was that these brake codes do not appear to reset even if the condition clears. You have to do it with the DLC3.
Once I did that, the alarm went off, the pump worked properly, and all is good (on that front if not others) again.
What a palaver.
sim
