07-25-2015, 11:29 PM
OK, I needed new pads & rotors for my 94 cab so I decided to upgrade to M030 front calipers and disks. The car stopped pretty well, with good pedal feel, but clearly it needed a good flushing and bleeding so I decided to go whole hog. I bought the car last April and hope to start doing DEs next season so I figured I'd make the change. I understand I really didn't need to change them but it also gave me the opportunity to paint the new (used but in good shape) calipers red before installation. I also wanted to install braided ss brake lines, and a 5/33 proportioning valve at the same time.
I bought the F&R M030 calipers and front cross-drilled disks from a dismantler and they were in great shape. The pads that came with the calipers were like brand new as were the disks. I think the pads are OEM but not sure. I ordered new cross-drilled cryo StopTech disks for the rear. I disassembled the front calipers before painting and they were in great shape except the vibration dampers were stuck inside the pistons on three of the four sides. These were the kind that are weights that fit inside the piston hollows connected together by thin shims behind the pads. I was able to get some out but needed to buy 4 new pistons, 2 large & 2 small. The bores were immaculate and the rebuild & painting went well. I didn't rebuild the rears as they were in great shape with no damber issues.
I started the install and immediately couldn't get the caliper mounting bolts to budge. I became chicken, gave up and took it to a local Porsche specialist for the install. He's usually very good but quite expensive. He and his assistant both have 944/944S2 and 968 experience. They performed the install while we were on a 10 day Cali vacation. Well, even then it wasn't ready upon our return. It took another 2 days to pick it up. I was a bit annoyed.
I should have been concerned. When I went to pick it up the pedal felt like crap. Way too long travel and a spongy feel. They stated that they bled the brakes twice. They also made a small adjustment to the master to try to improve the pedal travel. They suggested that I needed to bed the pads in and then it should be OK, but bring it back if it doesn't get better. Well, I bedded the brakes over 2 evenings and still no, or at least marginal, improvement. Today I tried to brake hard enough to engage the anti-lock to try to get the air, if any, out of that system. I couldn't get them to trigger the anti-lock. The overall braking now is far worse than when I started.
Clearly I will bring it back since I was charged way too much but I need some thoughts to at least provide some guidance to the guys. What directions should I provide the shop to hopefully get this thing right?
I bought the F&R M030 calipers and front cross-drilled disks from a dismantler and they were in great shape. The pads that came with the calipers were like brand new as were the disks. I think the pads are OEM but not sure. I ordered new cross-drilled cryo StopTech disks for the rear. I disassembled the front calipers before painting and they were in great shape except the vibration dampers were stuck inside the pistons on three of the four sides. These were the kind that are weights that fit inside the piston hollows connected together by thin shims behind the pads. I was able to get some out but needed to buy 4 new pistons, 2 large & 2 small. The bores were immaculate and the rebuild & painting went well. I didn't rebuild the rears as they were in great shape with no damber issues.
I started the install and immediately couldn't get the caliper mounting bolts to budge. I became chicken, gave up and took it to a local Porsche specialist for the install. He's usually very good but quite expensive. He and his assistant both have 944/944S2 and 968 experience. They performed the install while we were on a 10 day Cali vacation. Well, even then it wasn't ready upon our return. It took another 2 days to pick it up. I was a bit annoyed.
I should have been concerned. When I went to pick it up the pedal felt like crap. Way too long travel and a spongy feel. They stated that they bled the brakes twice. They also made a small adjustment to the master to try to improve the pedal travel. They suggested that I needed to bed the pads in and then it should be OK, but bring it back if it doesn't get better. Well, I bedded the brakes over 2 evenings and still no, or at least marginal, improvement. Today I tried to brake hard enough to engage the anti-lock to try to get the air, if any, out of that system. I couldn't get them to trigger the anti-lock. The overall braking now is far worse than when I started.
Clearly I will bring it back since I was charged way too much but I need some thoughts to at least provide some guidance to the guys. What directions should I provide the shop to hopefully get this thing right?
