It is just a push fit into the cylinder with two seals to stop the fluid coming out. When you pressure bled the system did you spill any fluid in the area of the master cylinder?Īlso check where the fluid reservoir sits on the top of the master cylinder for leaks. So you suggest I look into replacing the rear seal of the master cylinder? Not that I can see into the booster to tell if there is any fluid in there, but maybe it's around that seal where the leak is?īillofdurham wrote:Is the fluid in the reservoir going down at all? If fluid is getting in there it will be leaking from the rear seal of the master cylinder."
Brake fluid leaking between master cylinder power booster driver#
"There should be no brake fluid in the brake booster, it is there to assist the driver to apply pressure to the master cylinder by vacuum. Before I started bleeding the system with the pressure bleeder I pressurized the system at the resevoir to 10 psi and didn't see any pressure loss after 10 minutes or so. It is just a push fit into the cylinder with two seals to stop the fluid coming out." "Also check where the fluid reservoir sits on the top of the master cylinder for leaks. "When you pressure bled the system did you spill any fluid in the area of the master cylinder?" "Is the fluid in the reservoir going down at all?" You saw I cross listed this question elsewhere. are there any known problems with a seal in the brake booster?īill, thanks for your response. i'm hoping someone here has experienced similar problems and can help point me in the right direction. My hunch is that it could be coming from the brake booster, but that's really just a guess. nothing drips down the engine compartment side of the firewall and i pulled up the carpeting inside the car to see if i could get a better look from in there, but nothing. thing is i can't figure out where it might be coming from if it is brake fluid. i found it just under the car where the firewall meets the floor pan under the driver's seat. I think i may have found some fluid, but i'm not sure if it's even brake fluid though it's light and slightly oily. in doing so i used my power bleeder and didn't find any loss in pressure through the system there. i also just bled the brakes and flushed the system with fresh fluid. i have checked all lines, around the calipers, at the distribution box, below the master cylinder and the resevoir. I have a 1987 245 and am trying to figure out a mysterious brake fluid leak.
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