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Pulsating brake pedal, feels like abs?!, (yes... I searched)

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Old Jul 23, 2005 | 02:31 PM
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Pulsating brake pedal, feels like abs?!, (yes... I searched)

When I brake i can feel the pedal puching back at me, It feels exactly like ABS, But I don't have abs, It's really weird.
I dunno how to really explaine it, And it does it more when the brakes are warmed up. The best way to explain it is it feels just like ABS but it happens with even just a little pressure applied.
The car is a 1990 GTU/GXL I dunno wich one it is,and the title says gtu/gxl????
It has 2 piston front calipers, ventalated.
and sometimes it doesn't feel as bad as other times.
please help a brotha out!!!
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Old Jul 23, 2005 | 02:44 PM
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Sounds like warped rotor(s).
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Old Jul 23, 2005 | 03:10 PM
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i had this problem with my p.o.s. corolla. it was the brake rotor. you probably need new brake pads as well. do a self inspection and save some money.
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Old Jul 23, 2005 | 07:06 PM
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thanks, I suppose it would be to messed up to just resurface them?
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Old Jul 23, 2005 | 07:08 PM
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new ones really arent that expensive. if you have the money id just replace them.
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Old Jul 23, 2005 | 07:44 PM
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its a GXL if it has the 4 piston front calipers, if its a GXL it might have ABS, check the engine fuses and see if there is a yellow 60 amp one in the ABS slot, its marked on the fuse cover.

but if not, yes, warped rotors, get them replaced, you can buy them from napa for 19$ each new.
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Old Jul 24, 2005 | 02:35 AM
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wow that's alot cheaper than I expected.
I was thinking if it was worped rotors I would feel it in the steering though right?
b/c I only feel it in the brake pedal, I will check to see if it has abs, I haven't seen a light for it though.
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Old Jul 24, 2005 | 02:45 AM
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warped rotors are a misnomer. The real reason why they are doing that is because the brake pads have built up spots on your rotors of brake pad. If they are broken in properly or a spot occurs due to the ebrake or something similiar they will create a bump. Then the bump continues to grow because it is more sticky than the bare metal. That is why you get bumpy brakes.
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Old Jul 24, 2005 | 06:06 AM
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yeah, i agree with Agent_D that you should just get new rotors. they aren't very expensive or hard to put on.
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Old Jul 25, 2005 | 01:12 AM
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yea i'll just grab some new rotor's and pads,
thanx for the help guys!
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Old Jul 25, 2005 | 10:19 AM
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I had this exact same problem. Mine turned out to be the brake disk screws backed out, and the disc itself was wobbling on the hub. Check and make sure this didn't happen
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Old Jul 26, 2005 | 01:18 AM
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From: lincoln nebraska
I will.
I also looked at the fuse holder in the eng. bay and where it says a ABS fuse should be there is no fuse, but the prongs are there for one.? does this mean it shoul dhave one and it not there? b/c I would think that if i don't have abs the prongs wouldn't be there.
thanx again for the help.
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Old Jul 26, 2005 | 06:46 AM
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Originally Posted by RedFox
warped rotors are a misnomer.
Oh no it's not...
Hondas are notorious for this.
Try and torque your lug nuts to different torque specs.
The brake rotors WILL warp.
Can you tell the class why?


-Ted
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Old Jul 26, 2005 | 08:26 AM
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Originally Posted by RedFox
warped rotors are a misnomer. The real reason why they are doing that is because the brake pads have built up spots on your rotors of brake pad. If they are broken in properly or a spot occurs due to the ebrake or something similiar they will create a bump. Then the bump continues to grow because it is more sticky than the bare metal. That is why you get bumpy brakes.
This is true sometimes after not properly cooling down brakes during break-in. Once you get performance streetpads hot during initial break in the top surface of the pad will melt onto the rotor causing the bump, but it doesn't sound like he's breaking in pads. His issue definatly sounds like rotor warp.

BTW, ABS feels like stepping on a bag of tostitos. It's crunchy.

Last edited by F1blueRx7; Jul 26, 2005 at 08:40 AM.
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Old Jul 26, 2005 | 11:53 AM
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in all of my other cars, It felt likesomething pushing back at you, like a pumping action, and that is what this feels like.
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Old Jul 26, 2005 | 12:13 PM
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The ABS in my audi and in my rx7 both give a very "crunchy" feel while the valves in the ABS adjust to pulse the brakes.
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Old Jul 26, 2005 | 01:13 PM
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A rotor can also warp when it's a sliding caliper design and it stops sliding, or it's a fixed caliper and one side siezes.
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Old Feb 2, 2006 | 10:31 PM
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Originally Posted by RedFox
warped rotors are a misnomer. The real reason why they are doing that is because the brake pads have built up spots on your rotors of brake pad. If they are broken in properly or a spot occurs due to the ebrake or something similiar they will create a bump. Then the bump continues to grow because it is more sticky than the bare metal. That is why you get bumpy brakes.
wait are you saying my brake pads have genital warts? Are you sure about this information?
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Old Feb 2, 2006 | 11:04 PM
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i found the other day in the rain that 90 gxls dont have abs. either that or someone decided to steal the fuse. if i stuck one in there would i have abs?
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Old Feb 2, 2006 | 11:33 PM
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The ABS unit is a big block of metal with a bunch of brake lines going in and out of it. It's REALLY obvious if you have it or not - trace the lines coming off the master cylinder. If they go more or less straight out of the engine bay, you don't have ABS. If they go into a big block with all sorts of lines going in & coming out, with electrical cables going to it, you have ABS.

Now, having ABS doesn't mean it's *working*, but... if there's no big unit, you don't have ABS.

Onto the original post: Have you tried bedding your brakes in?

http://www.stoptech.com/tech_info/te...e_papers.shtml
http://www.stoptech.com/tech_info/faqs.shtml

My FC does this as well, and after I go bed the brakes in hard, it's silky smooth for a while. Plus the rotors turn that beautiful shade of blueish-grey.

I don't know why it comes back - I suspect I have a caliper sticking somewhat, but there's a 5 lug swap sitting in my garage so I don't really care.

-=Russ=-

-=Russ=-
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