JasonV Posted October 14, 2013 Share Posted October 14, 2013 hi guys had my civic go for its MOT last saturday and it failed on reserve brake pedal movementin other words the brake pedal goes straight to the floor when i push on it now i've bled the system in the correct order RR FL RL FR with the engine offthe pedal is solid as it should be when the engine is offi have also changed the master cylinder and the servo to try and eliminate to see if that was the issue but still goes down to the floor when the engine is running i have checked for leaks all along the system and cannot find a single leak anywhere any ideas guys because its got its retest this friday and i really want to get her back on the road ! Quote Link to comment Share on other sites More sharing options...
DeLaSoul Posted October 15, 2013 Share Posted October 15, 2013 Firstly - where did you get that bleed order? Assuming your car is right hand drive it should be RL RR FL FR. You always bleed with the engine off so that's right, and shut the bleed valve off with the pedal down - were you doing that? Did it have this same exact fault with the old master cylinder and servo? What you have described is 1 fault and 3 possible causes you've addressed (brake fluid, servo and master cylinder) so how were you sure which one was the issue? I've had a similar problem on several cars and 95% of the time it's the fluid. The other 5% was brake flexi's which you'll need someone to push hard on the brake pedal and go hunting carefully around all the lines for splits and bulges. I doubt this is the issue if it's only doing it with the engine on as the servo is an "assistance device" and only adds a modest amount of pressure - I don't even run a servo in my car!! If the pedal is hard after each part of the system is bled I would say you did it right but worth re-checking, then the brake flexi's. If that's not the issue I'd start the car with the vacuum to the servo disconnected and see what happens. It is really a process of elimination! Not sure if that helps, but give it a try.Dave Quote Link to comment Share on other sites More sharing options...
JasonV Posted October 15, 2013 Author Share Posted October 15, 2013 HI Dave, Thankyou for the advice i found the order in my haynes manualit is indeed right hand drive what is the pedal suppose to feel like when the engine is running is it suppose to have a small amount of play and it be rock solid or is it suppose to press down a fair amount and then be solid ? Quote Link to comment Share on other sites More sharing options...
DeLaSoul Posted October 15, 2013 Share Posted October 15, 2013 Hi, The order for bleeding the fluid is to start with the wheel furthest from the master cylinder and work your way forward. Can't think a car that's different on all the cars I've ever done but I love the old Haynes manuals - refitment is the reverse of disassembly!!! On my car, when I had the servo, the pedal would be solid with the engine off, took a lot of effort to get any travel at all. With engine running, the pedal was very firm but I could push hard enough to get the pedal to go down an around an inch but very very very slowly. I can only guess that fluid can still get around the seal in the master cylinder given enough effort so as nothing else in the system breaks and leaks. Not sure what else to suggest? Quote Link to comment Share on other sites More sharing options...
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