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Posts: 40
Joined: 15 Apr 2002, 22:26
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Post by andyg » 30 Jul 2002, 23:13

Can anyone help??
I have tried nearly everything i can possibly do but the brakes on my ZX are s**t, the peddle is really spongy and the feel you get is of drums all round, not of discs - there is no initial bite. I have not as yet changed the servo or master cylinder but almost everything else has been changed. From Green Stuff pads to Mintex to Bendix and from Genuine discs to cross drilled and grooved, new flexies, new fluid and new vacuum hoses but to no avail, i still end up with a spongy peddle and wooden stopping power! - ANY IDEAS?

Posts: 287
Joined: 20 Jul 2002, 20:37
Location: United Kingdom
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Post by gjb02 » 31 Jul 2002, 01:38

Have you checked your vacuum pump? There's one on the righthand side of the rocker cover, and there was an earlier type of vacuum pump that was driven by the aux drive belt, they are both connected to the brake servo by some form of hose though. Check for suction by running the engine and disconnecting the hose at the servo or pump outlet. I expect some of the more experienced Oracles may have a better idea, but it is worth a thought. It could just work..Hope you find out the cure, regardless.<img src=icon_smile.gif border=0 align=middle>
Edited by - gjb02 on 30 Jul 2002 20:41:55

x 48

Post by Jon » 31 Jul 2002, 18:20

Gareth is close with the vacuum pump, yours will be the cam drivem type. I doubt whether fault lies with pump (easy to test by pulling the pipe off it with the engine running), but theres a valve where the pipe from the pump goes onto the servo that gives trouble, and can cause the spongy pedal.
Also worth checking: Front caliper slides move freely back and forth, found that one side was completely seized on my last ZX TD, and upon freeing off brakes felt much better. Also, look at the rear brakes and see if they are doing much work. If they don't appear to be doing a lot they may require cleaning up and copaslipping. I've also found that the small( situated in the rear brake line) brake compensators fail, causing insufficient effort to the rear brakes, which again gives poor braking and a mushy pedal.
Jon Wood
IT Supervisor
GSF t/as Andyspares