SteveL Posted May 22, 2006 Share Posted May 22, 2006 Dunno if anyone has had this or diagnosed it.... Pedal travel on first push is more than on all successive pushes. No real difference in braking power, just pedal travels less. If brakes are then used again the same happens. Normal checks/changes have been done - fluid/bleed etc. UK spec front and rear, front disks are apparently due for replacement soon - but not significantly worn. Fluid is Motul HF600 and Porterfield Race pads with braided lines as well. Any ideas anyone. I'm considering Master cylinder refurb/replacement at the mo. Is there any other part of the system that could need maintenance/replacement? Cheers Steve. Link to comment Share on other sites More sharing options...
Digsy Posted May 22, 2006 Share Posted May 22, 2006 You could try testing the brake booster by "pumping up" the pedal with the engine off, then with your foot on the brake (which by now should feel very firm) start the engine. The pedal should sink to the floor as the engine builds up the vacuum assist. Link to comment Share on other sites More sharing options...
SteveL Posted May 23, 2006 Author Share Posted May 23, 2006 Hi Digsy, Tried that and all as it should be - so at least thats ok. Cheers. Steve Link to comment Share on other sites More sharing options...
SteveL Posted May 25, 2006 Author Share Posted May 25, 2006 Does anyone else have any ideas / suggestions? Cheers. Link to comment Share on other sites More sharing options...
Ian C Posted May 25, 2006 Share Posted May 25, 2006 How worn are your pads? -Ian Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 25, 2006 Share Posted May 25, 2006 Put new discs and pads in it. Link to comment Share on other sites More sharing options...
Digsy Posted May 25, 2006 Share Posted May 25, 2006 If it feels like you can pump up the cylinder by sucessive pedals pushes, but there's no leakage externally or air in the system then it sounds more like a fooked master cylinder to me. Link to comment Share on other sites More sharing options...
SteveL Posted May 25, 2006 Author Share Posted May 25, 2006 Cheers guys : IanC - pads are only about 1K miles old. Chris - From what I remember, the brakes have been the same since new disks a nd pads were fitted - I just got used to them. It wasn't until someone else drove the car an commented on the brakes that I appeared to have an issue. Digsy - Fooked as in replace whole MBC or just service? Link to comment Share on other sites More sharing options...
Scoboblio Posted May 25, 2006 Share Posted May 25, 2006 If it feels like you can pump up the cylinder by sucessive pedals pushes, but there's no leakage externally or air in the system then it sounds more like a fooked master cylinder to me. I had exactly the same problem on my old Mondeo - turned out to be the master cylinder I needed a new one but it wasn't that expensive. Link to comment Share on other sites More sharing options...
Kranz Posted May 26, 2006 Share Posted May 26, 2006 If it feels like you can pump up the cylinder by sucessive pedals pushes, but there's no leakage externally or air in the system then it sounds more like a fooked master cylinder to me. Aye, agree here. Seals on master cyl getting worn. First push allows a bit of fluid past the seals before they seal against the bore. Once sealed they retain a bit of pressure that allows them to keep the seal for a while... until it slowly leaks past. Eventually a master cyl recondition or new cyl will be required. Easy test to do. After being left overnight start the engine and *very slowly* press brake pedal. If it sinks to the floor its the seals. Next day do the same thing but stamp on the brake pedal. If it goes hard (ooh err) quickly, that's the fault confirmed. Seal kits are only about a tenner, and if the cylinder is worn it can be honed out (I have a brake hone) and a slightly oversize seal kit bought. I've done a few and its a piece of p*ss. PM me if you want to borrow the brake hone. Link to comment Share on other sites More sharing options...
SteveL Posted May 29, 2006 Author Share Posted May 29, 2006 thanks k14 sup, I'll give this a try this week... not near the car at the mo.... Link to comment Share on other sites More sharing options...
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