Resurrection of my CQ20V

[Error404]

Indeed. The hydro systems works well when it's in good order. Once bits start going wrong the bills are outrageous. My advice is start planning your vacuum conversion now

[Bowie69]

Hmm, possibly, that or the aggressive pressing of the brake pedal....? Gonna put a small hammer in my car

At £250 once delivery is added from QC (or anywhere else I guess), a vacuum system looks very tempting...

Thinking is, at 25 years and 187K the pump, servo and bomb are all likely to be pretty knackered, pump already seeps a bit, so could end up changing the lot out which would be way more £££s than a simple servo system....

[diesel des]

My Urs4 did this and a tap with a hammer near the servo would "fix" the problem for a while. Maybe your spannering had the same effect as my hammer. I'm now on a vacume system...

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[Bowie69]

OK, so a weird one yesterday!

After a re-start the brake pedal became intermittent in its action, and was pulsating whilst I rested my foot on it, without the car even moving. Pulsing was related to engine revs.

All the threads I have read suggest that this is a dead bomb, in fact doing the engine off bomb test gave me sufficient info to say it was -I had zero pumps before it went solid(!)

So, in keeping with the diagnostics threads, I removed the brake servo return line, after I worked out which one it was (the one on the top), nipped it up and started the engine, held revs for 20 seconds, stopped, removed return line again -no drips whatsoever. Great, must be the bomb then -£240 quote from Quattro Corner arrived by email...

Put it all back together again (including the brake master reservoir, as I had to remove it to get access to the return line once rounded, new union and re-flared the end of the pipe), started the car to check for leaks -none, and no juddering pedal either.........

Test drive -perfect, in fact sharper than they have been for a while, emergency stops from 60MPH to nothing, ABS kicking in nicely, multiple times, and pedal feels perfectly good and normal...

Only thing I can think is the check valve got grot stuck in it -but is this even possible? Would that cause the problem?

Pentosi was changed a year or so ago, so looks pretty clean.

Any other thoughts?

Or do I just go for vacuum servo

[Bowie69]

Nope.