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What's wrong with my brakes...

Remix-

By Remix-,
in General Automotive Discussion

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Remix- Mentor

Remix-

Posted
Posted

After a few hard brakes and some spirited driving in the gtst, i was cruising down a street and went to hit the brakes and there was nothing there!! The pedal went all the way to the floor, i pumped them then it sort of came back then there was nothing. I left the car at home then the next day went for a drive and everything is perfect again? Though i am feeling very uneasy about braking atm after what happened. Any ideas would be greatly appreciated!

Some of my thoughts:

Brake master cylinder is on the way out?

Brake fluid is crap?

Brakes need to be bled?

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Jae_s15 Rookie

Jae_s15

Posted
Posted

I would guess that you more than likely need the brakes bled and get new fluid. Sounds like you current brake fluid has absorbed a fair bit of water and is boiling really easily, as the spongy pedal is the main symptom of overheating fluid. Don't know what you currently use, but it might be worth upgrading to something like a DOT 5.1 fluid or something along those lines.

If that doesn't fix it, then have a better look at other possible problems.

Cheers,

Jae.

slipperywhenboosting Contributor

slipperywhenboosting

Posted
Posted

If you have cheap brake pads on it and you were driving hard you may have heated the pads up past their working temperature causing them to lose there resistance which would explain why they worked fine afterwards,(they cooled down) this happens a lot when the pads are low aswell, i dont think it would be the master cyclinder, check for leaks anywhere on the brake line or the master cylinder though.

benm Grand Master

benm

Posted
Posted
Thanks mate, i will bleed the brakes the following weekend and change the fluid.
My suggestion would be to take it to the best brake mechanic in your area and explain what happened. You are best off getting new brake fluid (which involves getting them bled). I spent ~9mths with a very bad brake pedal and driving was no fun. It cost well over $2,500 in total, I got everything fixed/upgraded because the feeling of having no brakes is the worst and I was happy to spend money to ensure it doesn't happen again.

Once your fluid has boiled, replace it.

I boiled/cooked my brakes so badly after literally 2x 10 lap sessions (very average speed laps too) at Eastern Creek that it destroyed my brake system. Pedal went to the floor, pumping it did nothing, had to limp home and it basically spent the next week at a workshop and took more than 5 mechanics and ~9mths of mucking around to get the problem solved.

Good quality DOT5.1 will cost about $100 and an hour of their time. Depending on how much damage you have done you may also require new brake pads which could be around $200 all up.

It's fun hitting boost and watching that speedo increase rapidly, it's not fun watching the car infront get closer and closer with your foot already firmly on the pedal.

riggaP Veteran

riggaP

Posted
Posted

Sounds like you cooked the brakes. Better pads and fluid should fix it.

The same thing happened in my previous car, which was caused by a faulty handbrake. The master cylinder followed soon after :) It had a similar feeling under the pedal but a lot more expensive to fix.

SLIM V 2.1.0 Enthusiast

SLIM V 2.1.0

Posted
Posted
After a few hard brakes and some spirited driving in the gtst, i was cruising down a street and went to hit the brakes and there was nothing there!! The pedal went all the way to the floor, i pumped them then it sort of came back then there was nothing. I left the car at home then the next day went for a drive and everything is perfect again? Though i am feeling very uneasy about braking atm after what happened. Any ideas would be greatly appreciated!

Some of my thoughts:

Brake master cylinder is on the way out?

Brake fluid is crap?

Brakes need to be bled?

I reckon you should take another driving test?

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