daninchainz Posted February 20, 2020 Share Posted February 20, 2020 Hi, have an r32 with r33 big brakes/5 stud all round and gktech braided lines. Have bled it up, pedal is still very soft, no obvious leaks either but will give it a full flush on the weekend and post results. I was just wondering if people have had issues with the master cylinder/brake booster when doing this conversion or is there a proportionate valve that could make the pedal feel crap? Or is it just how the pedal feels with this conversion. Car is going through cert so needs to be firm Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/ Share on other sites More sharing options...
niZmO_Man Posted February 20, 2020 Share Posted February 20, 2020 Bled the ABS module? Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925100 Share on other sites More sharing options...
daninchainz Posted February 20, 2020 Author Share Posted February 20, 2020 Has been deleted Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925101 Share on other sites More sharing options...
KiwiRS4T Posted February 20, 2020 Share Posted February 20, 2020 What do you mean by "soft"? Does the pedal go down a long way? Is it easy to depress? or does it continue to sink after first applying it? Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925103 Share on other sites More sharing options...
daninchainz Posted February 20, 2020 Author Share Posted February 20, 2020 Goes down 1/2-3/4 of the way with no pressure, pump it up a bit gets firmer but still goes down about 1/2 Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925104 Share on other sites More sharing options...
GTSBoy Posted February 20, 2020 Share Posted February 20, 2020 R33 calipers are hydraulically identical to R32 calipers, and in fact should feel firmer because they physically flex a little less, being iron instead of alloy. So, no, it should not be spongey and it is not a feature of this combo. The brakes are simply not properly bled, or there is a hydraulic problem. How are you bleeding them? Manual pump the pedal? You may have stuffed your master cylinder's piston seals by pushing them past the end of the normal travel into caked on crap on the cylinder wall. That can tear the seals. It happens. Power bleeding is much more effective. Also, have you made sure that you've put the calipers on the correct sides? Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925111 Share on other sites More sharing options...
Duncan Posted February 20, 2020 Share Posted February 20, 2020 It really does sound like a bleeding issue. A mismatched master cylinder creates a long but consistent pedal. Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925112 Share on other sites More sharing options...
daninchainz Posted February 20, 2020 Author Share Posted February 20, 2020 I have upgraded from the 4 stud small brakes to big. I had bled them by my self with a bottle and hose making sure the bottom of the hose was fully submerged so air wouldn’t get sucked back up and pumped the fluid through, the callipers are L and R but not sure about rears as I couldn’t see a mark, will get a mate to help bleed and if that fails will look in to master cylinder thanks ! Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925113 Share on other sites More sharing options...
Ben C34 Posted February 20, 2020 Share Posted February 20, 2020 Then it is definitely a bleeding issue. Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925115 Share on other sites More sharing options...
blind_elk Posted February 22, 2020 Share Posted February 22, 2020 On 2/20/2020 at 7:04 PM, daninchainz said: the callipers are L and R but not sure about rears as I couldn’t see a mark, Shouldn't need marks or anything. All you need to do is make sure the bleed nipple is at the top / highest point. Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925238 Share on other sites More sharing options...
daninchainz Posted February 23, 2020 Author Share Posted February 23, 2020 Callipers were on wrong side ? swapped them around, bleed nipple on top and bled up fine! Here’s to good braking ? 1 Link to comment https://www.sau.com.au/forums/topic/479800-r32-spongey-brake-pedal/#findComment-7925261 Share on other sites More sharing options...
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