lbcs_r_fun
Jedi Hopeful
Offline
HELP!!!
We are pulling our hair out over a very small BUT persistent leak at the front brake hose/caliper junction. The calipers are the later cast iron split-type and have been rebuilt by a reputable, well-known service company. Both cylinder seals are fine - dry as a bone under the dust boot. Fluid type is Dot 5. All other brake system components are new.
Under pressure test (brakes applied with temporary clamp on brake pedal, over 2 - 3 day period), a small drop appears every couple of days - enough to wet the end of your finger. Sounds minor, but of course this is unacceptable.
So far, we have tried several sets of new hoses (TRW from TRF), and copper and aluminum crush washers. We even honed the surface of the crush washers using crocus cloth/plate glass, until both sides were perfectly flat. We have examined the "pad" on the calipers, using a 10x jewelers's loupe, where the hose/crush washer seats and both are free of scratches or other damage that might prevent the hose/crush washer to seal. Also tried a special Permatex aviation grade hydraulic sealant - no effect!
Any suggestions would be appreciated. Right now this is a game stopper!
Thanks,
T
We are pulling our hair out over a very small BUT persistent leak at the front brake hose/caliper junction. The calipers are the later cast iron split-type and have been rebuilt by a reputable, well-known service company. Both cylinder seals are fine - dry as a bone under the dust boot. Fluid type is Dot 5. All other brake system components are new.
Under pressure test (brakes applied with temporary clamp on brake pedal, over 2 - 3 day period), a small drop appears every couple of days - enough to wet the end of your finger. Sounds minor, but of course this is unacceptable.
So far, we have tried several sets of new hoses (TRW from TRF), and copper and aluminum crush washers. We even honed the surface of the crush washers using crocus cloth/plate glass, until both sides were perfectly flat. We have examined the "pad" on the calipers, using a 10x jewelers's loupe, where the hose/crush washer seats and both are free of scratches or other damage that might prevent the hose/crush washer to seal. Also tried a special Permatex aviation grade hydraulic sealant - no effect!
Any suggestions would be appreciated. Right now this is a game stopper!
Thanks,
T