elmscroft Posted July 15, 2007 Share Posted July 15, 2007 Hi All, Wife has just told me the brakes aren't working on our 1997 90'. Pedal is hard, fluid level bang on and pad wear should be ok. servo pipework looks ok. Am going to look at it this afternoon. Is it a dual line braking on the 90'. Now she says brakes do work but stopping distance is the same as an oil tanker and she thinks it has been like it for a while. Only now did she think to mention it. Any pointers guys and gals. Many Thanks Mike Quote Link to comment Share on other sites More sharing options...
Les Henson Posted July 15, 2007 Share Posted July 15, 2007 To test the servo, press the brake pedal hard and then start the engine. When it starts the pedal should drop about an inch. There's a non-return valve where the vaccuum pipe connects to the servo unit (a white thing). After the engine has been off for a while, pull the valve out of the servo and there should be a hiss as the vaccuum is lost. This test determines if the diaphragm inside the servo has a split in it. A rock hard brake pedal is usually an indicator of servo failure. There should also be a brake pressure valve on the top of the chassis rail close to the drivers side footwell which equalizes pressure between front and rear brakes. Test the vaccuum pump by disconnecting the pipe form the pump and start the engine - there should be suction. You braking system is dual curcuit (or it should be!) two pipes from the master cylinder - one for the front brakes, and one for the rear. Les. Quote Link to comment Share on other sites More sharing options...
JimAttrill Posted July 15, 2007 Share Posted July 15, 2007 Do the tests as suggested by Les above. I would reckon your vacuum pump is stuffed. Unfortunately they are not servicable, though many have tried and some succeeded. A bit pricey as well. Quote Link to comment Share on other sites More sharing options...
elmscroft Posted July 15, 2007 Author Share Posted July 15, 2007 Hi, Done the test described, get suction at non return valve (nrv), which increases with rpm, but no hissing when removing nrv, so looks like diaphragm. Are well never a dull moment in our house. Just when everyone was back on the road. Now where's that credit card, again. lol! Many Thanks Mike Quote Link to comment Share on other sites More sharing options...
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