just bought a vehicle with super spongy brakes. Thought maybe there was air in the brake line so bled them out but no air bubbles or anything noticeable. Then replaced master cylinder cuz thought maybe seals are bad, etc. Still the brakes are spongy but firm up a little after the first press. Any thoughts?
>>28120631Does it have abs, could be air trapped in the abs module. Might also need to bench bleed the master cylinder.
>>28120631Also depending on the vehicle if ABS needs to be bleed you may need a scan tool with the ABS bleed function to do it right.
>>28120631I've had several cars come in with a spongy brake pedal that never gets better even bleeding the crap out of it, replacing the master and booster, bleeding the crap out of it some more, using a scan tool to ABS bleed it, and finally the fix was to replace the ABS hydraulic unit.
>>28120636This. Also, some cars require the rear brakes to be bled with the rear of the car in the air at a specific angle.
>>28121006>>28120644Good godEven my c4 (rube goldberg 90's shit-tronics) doesn't require this nonsenseWhat the fuck are manufacturers doing?
>>28120631>just bought a vehicle with super spongy brakeshonda? thats just normal
>>28120631Bleeding doesn't always work. Brake fluid can absorb water which causes sponginess. You can't do anything about it other than changing the brake fluid.
OP i took my car in to be looked at today with the same exact problem>bought shitbox with soft pedal>spend hours bleeding the fluid>replace the master cyl and the booster>change to braided brake lines>still soft as fuckmechanic said either the pushrod isnt adjusted correctly or the booster is fucked which i dont really understandi can feel the pushrod take up all the slack in the pedal almost immediately and if the booster was fucked it would be harder to press wouldnt it? also what's the odds of two boosters being broken in the exact same way?
>>28121195apparently there is an lspv that needs bled that I skipped when bleeding the brakes. Not sure if it will make a difference.
>>28121238yeah my car doesnt have one of those but good luck to you
