julians Posted January 6, 2002 Share Posted January 6, 2002 I have been replacing the brake fluid in my car today with castrol response super DOT 4 fluid, there dont appear to be any air locks in the system and the pedal feels fine (nice and firm), however now the rears are locking up before the fronts (the road is damp , but I've never noticed this before), they never used to do this, obviously changing the fluid has caused this ( I dont know what fluid was in it before), how can I restore correct balance, is it that I havent got absolutely all the air/old fluid out? Car has regular single pot brakes all round and normal master cylinder. Thanks again Julian Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted January 6, 2002 Share Posted January 6, 2002 If the pedal feels more firm than it did before, you've probably fixed a rear brake air lock. Either that or you have some air in the fronts. Can't think what else it could be. The fluid itself shouldn't effect front/rear bias. Link to comment Share on other sites More sharing options...
julians Posted January 6, 2002 Author Share Posted January 6, 2002 Yes, its certainly firmer than before, I'll have another go at bleeding the fronts and see if any more bubbles come out. Link to comment Share on other sites More sharing options...
Rob Walker Posted January 6, 2002 Share Posted January 6, 2002 Its normal to have the rears lock up before the fronts with the standard brake setup. There is too much rear brake effort as compared to the front. There are two solutions fit the uprated front brakes or fit Pagid front pads and some cheap rear pads. If you search the archives this subject has been covered many times. Link to comment Share on other sites More sharing options...
robmar Posted January 7, 2002 Share Posted January 7, 2002 Julian - I use the super dot 4, have the big front calipers and big master cylnder, when it is wet or damp m,y fronts also lock up before the back, but int he dry they seem pretty well balanced. The car is going in for a flat floor soon as I know the ride hieght and settings are way out, hopefully this will reduce the wet / damp weather lock ups. As a thought have you tried the old tapping of the rear calipers to remove any bubbles at the back end rob Link to comment Share on other sites More sharing options...
WILL FLY Posted January 7, 2002 Share Posted January 7, 2002 I had the same problem with my car within the first year so I gave it back to Caterham and told them I wanted it fixed. They fitted a set of Pagid RS14 pads which are great but expensive (about 170 quid a set). The alternative is to fit a brake bias valve which are fairly cheap. Roy See willfly.net for more info. If you don't spin you ain't trying smile.gif Link to comment Share on other sites More sharing options...
WILL FLY Posted January 7, 2002 Share Posted January 7, 2002 Rob you misread the posts, the problem is the REARS lock up first not the front. The fronts are supposed to lock up first. Where are you getting your car flat floored ? See willfly.net for more info. If you don't spin you ain't trying smile.gif Link to comment Share on other sites More sharing options...
robmar Posted January 7, 2002 Share Posted January 7, 2002 doh! well spotted Roy - need to talk re travel to autosport show rob Link to comment Share on other sites More sharing options...
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