Bleeding, Bleeding Brakes

Discussion in 'Technical Help' started by Geo63, Oct 8, 2025 at 11:22 PM.

  1. HELP!!!

    I have always had a modicum of trouble bleeding brakes systems, but have usually got there in the end.

    1) I have zero pressure on the 'pump' for both front and rear brakes. without a brake reservoir or pipe(s) fitted, both pumps squirt out residues of brake fluid when 'activated' So they seemingly work.

    2) Front brake. Top up reservoir, open the 'pump' by tying back the brake lever with a rubber band. Open caliper bleed nipples. Leave overnight. Result = Leakage. So gravity is getting the brake fluid down to the Calipers and out of the open bleed nipple(s)

    3) carry out the same procedure with the bleed nipples closed but the brake banjo unions cracked slightly open/loose. Leave overnight. Result = leakage, as above. so fluid is getting down there!

    4) carry out the same procedure but have the caliper bleed nipples and Banjos firmly 'closed'. Crack open the bleed nipple on the brake lever pump and leave overnight. Result = Leakage

    5) Rear brake, the same procedure but the brake 'cyclinder/pump' doesnt have a bleed nipple. same result with caliper bleed nipple and banjo bolt.... leakage as above.

    Brake fluid is getting where it should be. But try and bleed it conventionally, glass jar higher than the bleed nipple. Rubber tube fully submerged, slowly pump until not m ore bubbles come through.

    Absolutley zero pressure on the brake lever front and rear. pump pump pump, no resistance at all!

    WHAT am I doing wrong? I have successfully bled these brakes in the past. It cant be blocked caliper pistons, surely, as that would give me hard pressure on the levers? No?
     
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