shadycrew31

iTrader: (6)

Hi all,

So heres the deal. I canyon race (no need for commentary) and will start doing some auto crossing shortly as well as tracking.

Well actually I wont be able to until I get my baby fixed.
fist incident
heres what happens high speed 60-70 mph into a turn. I was going to hot into it and I taped the brakes only when I hit it i felt this chattering and immediately down shifted to save my ***. normally I don't hit my brakes that much going uphill. but the fact is I need my brakes in case something happens.

next incident
I'm going through S- turns same thing happens it feels like I'm trying to stop on gravel.

so me and my roommate decided there had to be some air in the system or the fluid was garbage. I went and got some ate and we went on bleeding the system. no air came out I got a little worried.

So I tested them again.
same thing chattering/gravel feeling through turns then some scary s*** happened. I again needed the brakes this time the brakes popped and the pedal went to the floor i tapped it twice to regain pressure got it back.. yea just a little scary.

Ive been reading allot about the DSC possibly doing this not really sure.

Maybe a faulty ABS system or some electrical problem.

anyone help please .

pads are fine.
rotors are fine.
fluid is ate so its not boiling and it does not have air in it.

shaunv74

Wow. You really shouldn't be braking while you're in the corners. All you're doing is upsetting the car and engaging your DSC. That's telling you you're not driving it right. It's saving your *** right now.

Brake before you get to the corner, maybe as you turn in a little if you need some more rotation (trail braking) but then you should be applying a little gas to keep a constant speed and the suspension loaded while traveling through the corner and then accelerating as you unwind the steering.

My advice is to go to a track day and learn proper corner technique. It will improve your skill and probably save your life if you're going to continue to street race.

shadycrew31

iTrader: (6)

I appreciate the reply However this still doesn't answer my question..

DSC is not saving my life if I have no brake pedal?!!??...

The brakes pop before and after turns through s turns etc anywhere really. I only use brakes right before the turn not in the apex that would be foolish. I never once said I used the brakes during, I used the word "into" the turn, meaning prior to the actual turn. However sometimes (very rare) I'm just going to hot and I need to tap the pedal in the turn.

It happens randomly which is what is scary. before the turn after the turn all over. and one time it happened when hit the brakes on the freeway.

I have been driving on tracks using shifter carts since I was 16. Ive been driving the canyons for the past 5 years. I'm looking at getting into auto cross I'm not a dumba** I'm just looking for some good info.

sorry If I sound a bit upset..

shaunv74

Sorry if I got the wrong impression. This post made it sound like you were braking in the middle of turns and over driving the car.

If the pedal is going to the floor I would try bleeding the brakes again. What you're describing is very atypical of our brake systems. I and most others that track the car typically are very satisfied with the brakes even stock.

You may not get air out right away or it may be how you're bleeding the brakes. My advice is the bleed the master cylinder first so you're getting fresh fluid in the reservoir.

then Bleed the passenger rear wheel first. Then driver rear wheel. Then passenger front. Then driver front. Then clutch line. (it shares the brake fluid).

Make sure you're completely flushing out the old fluid.

If it's still happening there may be something funny going on with your master cylinder and you should take it to the dealer.

Hope that helps.

Nubo

Well, I wouldn't suspect air in the lines if the problem is intermittent.

One possibility would be that somewhere in the system the fluid has reached the boiling point. Either from lots of braking, a stuck caliper/shoe causing overheating, or significant water contamination which lowers the boiling point, or incompatible fluid(s).

Can you reproduce the problem in the garage?

I sure wouldn't be driving it, much less racing, imho.

shadycrew31

iTrader: (6)

I did the correct bleeding process doing the master cylinder before and after all the other lines. No air came out when I did that.

I replaced stock fluid with ate super blue so theres no way it could reach its boiling point.

its all very strange. I don't plan on racing it until I figure out what it was I only brought it out twice. first time I noticed the problem, then I tried it again with the ate to see if it fixed it and it didn't.

Dealer it is!!

thanks guys!

swoope

iTrader: (5)

check the diy section.

i dont recall the mc vs the rest of the caliper order. but it is important..

i did it with speed bleeders and ate super blue..

what you describe is a bit pretentious..

if it is going to the floor it is air, leak.

if you pump it and it comes back.. seal..

what you kinda describe is abs related. but are the brakes chattering or the pedal pulsating?

beers

Nubo

Understood. Just trying to relate to my own limited experience. The only time I had a brake pedal that would sometimes work, and sometimes "pop" down to the floor, it turned out to be from a stuck brake on one wheel that was overheating the caliper. If it gets hot enough even new fluid can boil.

Not familiar with seal problems that would be intermittent. In my experience they either leak or they seal. But I don't pretend to undertand the mechanicals of ABS...

shaunv74

Good luck. Keep us posted as to what you find. None of us want to share your experience.

shadycrew31

iTrader: (6)

more like pedal pulsating violently. its going to Mazda this week for the ball joint recall, ill get them to have a look at the abs system. till then happy driving!

shadycrew31

iTrader: (6)

Well ladies and gents I figured it out.. there was air in my abs unit... Put the ignition to the on position and bleed as normal, air will come out and your brakes will feel like sex again..

Brakes are stellar now.. plus i fitted my SS lines on so thats fun to.