Markie Posted October 7, 2007 Share Posted October 7, 2007 I am changing the front and rear pads at the moment as they have never been done since I have had the vehicle and it just felt like they needed doing etc. First rear lot were fine. But the second rear is proving to be a problem. I have removed the caliper and old pads, pins etc and just pushed the brake a bit to check the pistons were moving freely just like I did the other side. They seemed to move, well the one side anyway. So I then tried to push them back in with a g-clamp. The f*c*er aint moving at all and I have tightened it so much I think the next step is the clamp is going to snap as its bending as it is. Anyone have any ideas on what to try? Its not a MASSIVE clamp but its pritty heavy duty and no problem with the other caliper. I have also removed the fluid hose, so the caliper is totally removed from the car. Link to comment Share on other sites More sharing options...
colsoop Posted October 7, 2007 Share Posted October 7, 2007 Have you allowed some brake fluid to come out ? Link to comment Share on other sites More sharing options...
Markie Posted October 7, 2007 Author Share Posted October 7, 2007 After I removed the hose yes some come out. Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 7, 2007 Share Posted October 7, 2007 Pistons probably cocked over, put it back on the car, bleed it, and wedge the free piston, the get someone to slowly depress the brake and get the stuck one moving, then try again to retract it, applying even pressure. Link to comment Share on other sites More sharing options...
Markie Posted October 8, 2007 Author Share Posted October 8, 2007 Chris.. Not quite sure I get what you are on about there boyo.. One is stuck out the other one is pritty flat and not extended at all. The one thats stuck is the one thats on the wheel arch side of the caliper if that makes sense. Not the one facing the outside. Link to comment Share on other sites More sharing options...
Markie Posted October 10, 2007 Author Share Posted October 10, 2007 Well I am still trying to do this on and off. Had a little go again today. I managed to get the main side piston in by dismantling the caliper and putting it on an axle stand then lowering the car onto it.. Bit cowboyish but it did the trick After the initial couple of mm's it then went in the rest of the way with the G-Clamp. Now both pistons are re-tracted. However my next questions is how do I test that both pistons are freely moving or normal? Also, when the brake pedal is depressed should both pistons move in equaly or is it most common that the main piston moves in first but if you try and push this one back in the other piston starts to move? Sorry if it does not make much sense, just trying to see how I can check they are working properly as I have a feeling they are not operating as they should. Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 11, 2007 Share Posted October 11, 2007 Get them both right out of the calipers and in your hand, check for scoring (possibly caused by putting the weight of the car, via an axle stand, on a cocked over piston....) and for corrosion. Replace any damaged pistons, get an exchange caliper if either piston bore is scored or corroded. Be sure the caliper is for a MKIV Supra, some Lexus ones bolt straight on, but have different piston sizes, giving incorrect and potentially dangerous brake bias. I sell exchange calipers rebuilt on Supra cores in Germany, which are indistinguishable from a new one. Link to comment Share on other sites More sharing options...
HJM Posted October 11, 2007 Share Posted October 11, 2007 I sell exchange calipers rebuilt on Supra cores in Germany, which are indistinguishable from a new one. Are these UK 2 pot and if so how much would they be delivered ? Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 11, 2007 Share Posted October 11, 2007 I can only supply Jap spec calipers on an exchange basis, sorry. Link to comment Share on other sites More sharing options...
HJM Posted October 11, 2007 Share Posted October 11, 2007 I can only supply Jap spec calipers on an exchange basis, sorry. Thanks anyway Just keen to source some rears to help out with the front UK's Link to comment Share on other sites More sharing options...
T2 MSW Posted October 11, 2007 Share Posted October 11, 2007 how much for the Jspec's Chris? Link to comment Share on other sites More sharing options...
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