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+--- Forum: Suspension, Transmission, Handling & Braking (https://www.306oc.co.uk/forum/forumdisplay.php?fid=19)
+--- Thread: Soft brakes (/showthread.php?tid=32733)
Soft brakes - Nathan1305 - 10-12-2015
So ever since replacing the vacuum pump my brakes are really spongey, they are sharp and stop well but can push the pedal to the floor if I push reasonably hard, any ideas what can cause that just from replacing the pump?
RE: Soft brakes - Seb_Ryan - 10-12-2015
Got a leak somewhere.. Or slave/master is bust i think.
Or alot of air, but they wouldnt stop good then lol
RE: Soft brakes - Piggy - 11-12-2015
Not used to assisted brakes?
RE: Soft brakes - Jonny81191 - 11-12-2015
Are you're sure it's bled up properly? Pump the pedal a few times with the engine idling and hold the pedal down, if it's creeping down to the floor, there's most likely air in the system.
RE: Soft brakes - Niall - 11-12-2015
I'd agree with Poodle and Jonny here. Probably just not used to how they should be.
Like Jonny says, if you pump them up and it creeps to the floor, you have a leak. If not, it's fine really. If it really worries you that much you can try bleeding them again
RE: Soft brakes - Nathan1305 - 11-12-2015
Yeah it's just strange how it was fine before the pump went and now it's spongey when the pump was replaced. I'm not too worried as they are sharper than they ever have been :
I'll give it a bleed at some point
RE: Soft brakes - Eeyore - 11-12-2015
my 1.8 brakes were spongey too. I never did get to the bottom of why they were so crap. It made driving on the roads pretty bad tbh but on track they seemed to be fine :/
RE: Soft brakes - pug306driver - 11-12-2015
If with the engine running and the pedal creeps down to the floor, then there is a fluid leak somewhere, check all pipes, unions, pistons etc, as well as the master cylinder to the servo area. If no leak found, get an assistant to press the brake pedal for you sand watch the fluid level in the master cylinder res.
When pumped it will go down slightly, but watch to see if it rises as the pedal falls or goes to the floor, suggesting an "internal" master cyl leak.
RE: Soft brakes - RetroPug - 11-12-2015
Sometimes you just don't quite manage to get all the air out and once you've driven around a bit a re-bleed gets the rest out.
RE: Soft brakes - Nathan1305 - 11-12-2015
Yeah I think a good re-bleed is needed
RE: Soft brakes - insomaniac45 - 12-12-2015
dont meen to repeat what has already been said, but with the engine off, if the pedals still feel the same, then bleeding is required. it is a safety mechanism built into these things that if a something goes wrong mechanically, as long as there is fluid in the system, you can still exert pressure on the pads. albeit human pressure, not amped up
. My point is soft brakes are 90% of the time due to air in the system. the other 10% of the time its aging pipe work (just the experiences i've had in the past) Tony.