HELP!! car wont stop (brake issue)
 

STOCK BRAKES!

new slotted rotors
new stainless steel lines
new hawk hp brake pads


problem #1 brakes feel like a sponge
problem #2 you have to push the brake pedal almost half way for the car to start feeling it slow down

problem #3 the front brakes lock up if pressed @ 80% as if the abs doesnt work......... also the rear brakes dont show a sign of even applying pressure (have video if that helps)



I was told that i need to put the old pads on the car or put old rotors. And that you cannot break in new rotors & pads at the same time!

Bleed the brakes? Sounds like air in the system...

:icon_tup:

If it's not this, then your connections are not air-tight.

Also you should break in new pads with the new rotors, just follow the proper break in proceedure once you bleed the brakes properly.

APPRECIATE IT.... as far as the last comment i said about using old pads to break in the new rotors.. is that true?


@Bill......... the break in was done around january

common practice to use old pads with new rotors to break in rotors then to break in the pads...but not necessarily a necessity.

It will take longer to break in the new pads and new rotors to get rid of anti corrosion coatings they put on there...but time shouldn't be very long at all.

I say you are ok, just break them in properly.

We do it all the time at the track. :nod:

breaks seem to be more complicated...... seems not everyone should mess with them unless you know what your doing!


and bleed the system

It sounds like you have air in the lines.
Just pull the wheels off and bleed the lines.
Start with the rears first.

Where did you hear that from? It doesn't make sense to me. Can you explain? The reason why I ask is because Miata_mx5 posted this in my build thread https://www.rx7club.com/showpost.php...6&postcount=45

Would't it make more sence to use a flex hone on the new rotors to rub off the anti corrosion coating?


Also,to the OP, you should look up in the FSM for proper bleeding procedures, to make sure you have all the air out of the abs unit. That might be why the brakes lock up.

John

I've heard u never use old pads on new rotors and vice versa. If ur old rotors had a groove in it, the pad has a spot that put that groove there. So running that old pad on a new rotor will lead to disaster.

Run new stuff all around and the key is bleeding the system very well.

We bed fresh pads on fresh disks all the time...no issues were found.

John,

I said it was common practice cause its whats always been told to me, what I've always done, and what I've seen many others do. Right or wrong...well that's for you individuals to decide? As with everything we do, everyone has an opinion.

There is a potential downside to this practice. It works ok if you are keeping the same brake pad compound (or moving to a harsher one), but you could increase the new pad bed-in in time if your older pads are a harsher material than the new ones. In that case, once you get a transfer layer onto the new rotors using the old pads, your new pads (given the scenario of a milder pad) will take longer to remove the old transfer layer to achieve their own transfer layer.

I run into this when swapping track and street brake pads. It takes a bit for the street pads to work well again after the track pads have been used.

Checked everything.... come to find out it was the ABS pump!!!....... go figure!

but my question mahjik is that is it necessary to do that before adding new pads/rotors

Well think about it for a minute... Do they sell new cars with new rotors and old/used brake pads? Nope... ;)

bad ABS? or something else?

/\ it was the abs pump that was the problem



true true

How was the ABS pump the issue and how did you fixed it?

/\ the pump itself was dry of no fluid at all..... and you would check and the pump kept all of the brake fluid so the brakes only worked half way. while the computer thought the abs was kickin in......

think of it this way. if i lift up a heavy 200lb weight by myself i know that i will have to lift it on my own, but if your with me i dont have to work as hard. the Computer was thinking that the abs was working so it only did half the job of braking