rasheed
Well-Known Member
Wonder if I could pick your collective brains..
Lets start with what's been done. 3 years ago, replaced the accumulator with brand new Wabco unit. About 7 months ago, refurbed the ABS pump - pump side seemed fine, carbon brushes were worn and one of the little plastic brush holder arms was melted and deformed so the brush on that side had poor contact. I replaced the brushes and fabricated an arm from some kind of plastic fibre. Around the same time, flushed out all the brake fluid and put in brand new Castrol Dot4.
Now recently the pump runs a lot. Briefly but often. Symptom of a failing accumulator? Given the original lasted nearly 13 years I'm dismayed at the thought that the replacement has died so soon. Has this happened to anyone else?
Secondly, pump has started to occasionally seize. A tap with a spanner and it runs again. This led me to take it apart again and do a bit more work on my fabricated bits, they were sticking a little.. more on this in another post.
When I put the pump back of course I had to bleed the system. (what a pain!) and here was a big surprise. The fluid coming out was filthy. Ended up flushing the system again, used almost 4 litres. Where could all this dirt be coming from? Is it getting in from outside somehow? System has no leaks that I can find but still I wonder if this is somehow related to the inability to hold pressure. Can there be leaks that don't drip brake oil? Perhaps the filler cap on the reservoir, does it have a role re pressure?
As I've no way to independently check the accumulator I'd love to hear your thoughts before forking out another 100 or so for a new one, especially as that won't solve the black brake fluid problem I think!
Thanks fellas.
Lets start with what's been done. 3 years ago, replaced the accumulator with brand new Wabco unit. About 7 months ago, refurbed the ABS pump - pump side seemed fine, carbon brushes were worn and one of the little plastic brush holder arms was melted and deformed so the brush on that side had poor contact. I replaced the brushes and fabricated an arm from some kind of plastic fibre. Around the same time, flushed out all the brake fluid and put in brand new Castrol Dot4.
Now recently the pump runs a lot. Briefly but often. Symptom of a failing accumulator? Given the original lasted nearly 13 years I'm dismayed at the thought that the replacement has died so soon. Has this happened to anyone else?
Secondly, pump has started to occasionally seize. A tap with a spanner and it runs again. This led me to take it apart again and do a bit more work on my fabricated bits, they were sticking a little.. more on this in another post.
When I put the pump back of course I had to bleed the system. (what a pain!) and here was a big surprise. The fluid coming out was filthy. Ended up flushing the system again, used almost 4 litres. Where could all this dirt be coming from? Is it getting in from outside somehow? System has no leaks that I can find but still I wonder if this is somehow related to the inability to hold pressure. Can there be leaks that don't drip brake oil? Perhaps the filler cap on the reservoir, does it have a role re pressure?
As I've no way to independently check the accumulator I'd love to hear your thoughts before forking out another 100 or so for a new one, especially as that won't solve the black brake fluid problem I think!
Thanks fellas.
