TT Calipers Leaking Help?
02-20-11, 02:54 PM
#1
TT Calipers Leaking Help?
So I picked up a set of used TT front Calipers and bought the rebuild kit. Did the rebuild installed all new stainless lines, pads and rotors. Everyting seams fine but I have a small leaking coming from the middle of the caliper where the two halves meet towards one of the sides. What can I do to fix this ? I heard you can not unbolt and take apart the two halves of the caliper due to factor torque specs or something is this correct ? Any input would really help I dont want to buy another new caliper.
02-20-11, 05:08 PM
#2
When you rebuilt the calipers, did you replace the piston bore o-ring, or just replace the piston boots?
If it's leaking from the individual piston areas; you may have pinched one of the o-rings, if you replaced those. That's the only place I think it could leak from if you didn't unbolt the two halves.
A caliper can leak from any one of the piston o-rings, one of the two small o-rings that seal the two halves, a damaged bleeder-screw seat and worst case-scenario, the caliper itself could be cracked.
Don't be afraid to separate the two halves to either clean or refinish; I've done it plenty of times and have no problems sealing on multiple sets of calipers. You have to be careful though, the small o-rings that seal the two faces are not included in rebuild kits and cannot be bought from Toyota as a part.
Torque spec for the Supra Turbo calipers are 23 ft./lb.
If it's leaking from the individual piston areas; you may have pinched one of the o-rings, if you replaced those. That's the only place I think it could leak from if you didn't unbolt the two halves.
A caliper can leak from any one of the piston o-rings, one of the two small o-rings that seal the two halves, a damaged bleeder-screw seat and worst case-scenario, the caliper itself could be cracked.
Don't be afraid to separate the two halves to either clean or refinish; I've done it plenty of times and have no problems sealing on multiple sets of calipers. You have to be careful though, the small o-rings that seal the two faces are not included in rebuild kits and cannot be bought from Toyota as a part.
Torque spec for the Supra Turbo calipers are 23 ft./lb.
02-20-11, 07:53 PM
#4
When you rebuilt the calipers, did you replace the piston bore o-ring, or just replace the piston boots?
If it's leaking from the individual piston areas; you may have pinched one of the o-rings, if you replaced those. That's the only place I think it could leak from if you didn't unbolt the two halves.
A caliper can leak from any one of the piston o-rings, one of the two small o-rings that seal the two halves, a damaged bleeder-screw seat and worst case-scenario, the caliper itself could be cracked.
Don't be afraid to separate the two halves to either clean or refinish; I've done it plenty of times and have no problems sealing on multiple sets of calipers. You have to be careful though, the small o-rings that seal the two faces are not included in rebuild kits and cannot be bought from Toyota as a part.
Torque spec for the Supra Turbo calipers are 23 ft./lb.
If it's leaking from the individual piston areas; you may have pinched one of the o-rings, if you replaced those. That's the only place I think it could leak from if you didn't unbolt the two halves.
A caliper can leak from any one of the piston o-rings, one of the two small o-rings that seal the two halves, a damaged bleeder-screw seat and worst case-scenario, the caliper itself could be cracked.
Don't be afraid to separate the two halves to either clean or refinish; I've done it plenty of times and have no problems sealing on multiple sets of calipers. You have to be careful though, the small o-rings that seal the two faces are not included in rebuild kits and cannot be bought from Toyota as a part.
Torque spec for the Supra Turbo calipers are 23 ft./lb.
02-20-11, 08:08 PM
#5
From what I've researched, Toyota does not offer a replacement for those seals. I've always reused mine and have never had any issues. I don't think regular o-rings will suffice, you may have to size-match ones made of teflon or viton to resist the properties of brake fluid and heat.
Almost sounds like the previous owner had them apart and forgot to install the seals or pinched them or even had some debris between the mating surfaces not allowing flush contact between the two halves.
I torqued my calipers at 15 pounds working from 2, 4, 1, and 3. Then went back with full 23 pounds using the same pattern. I looked at the caliper bolts left to right (1, 2, 3 and 4) 1 being the far left outside bolt and 4 the far right outside.
Almost sounds like the previous owner had them apart and forgot to install the seals or pinched them or even had some debris between the mating surfaces not allowing flush contact between the two halves.
I torqued my calipers at 15 pounds working from 2, 4, 1, and 3. Then went back with full 23 pounds using the same pattern. I looked at the caliper bolts left to right (1, 2, 3 and 4) 1 being the far left outside bolt and 4 the far right outside.
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