brake pedal pulsation

mudseeker · 05-03-2007, 07:00 PM

i'm trying to fix my sisters fiances truck. when you go to stop, the pedal litteraly pushes up on your foot about 3 inches. i replaced the front hoses that were about to rust in two and turned the rotors, yet i still pulsates. i jacked the front end back up and checked the hubs agian and still no play in them. the only thing i can think of is the rims need balancing, since i noticed the rims had no balancing weights. any help would be nice since i have never felt a pedal move like this.

edit:1991 chevy k1500 regular cab

Chevy808 · 05-03-2007, 10:08 PM

How's the brakes in the rear? Maybe the front is stopping the whole truck without any help from the rear. Just a thought.

mudseeker · 05-04-2007, 04:57 AM

forgot about that part. i replaced the shoes in the rear also, the shoes on the driver side were pretty wore down. i still want to say it is the rims but the front end doesn't shake while going down the road. the pedal pulsates no matter how much force you use on the pedal. i do not feel any play or movement in the steering while trying to stop either. it has 285 tires on it with no lift but torsion bars may be cranked up, also has lack of power steering assist if that helps out any.

gmctrucks · 05-04-2007, 08:24 AM

Are the pins that hold the caliper lubed also maybe the calipers are binding maybe rust rebuilt them or buy new ones. Hope this helps.

75K30 · 05-04-2007, 08:36 AM

Does that thing have ABS?

436'd skylark · 05-04-2007, 08:50 AM

Did you have the drums turned? Any way, take a pair of pinch pliers and put them on each brake hose one at a time and go for a ride. once you pinch the hose (effectivily disabling the brakes) and the pulsation goes away you'll know where the pulsation is coming from.

nnunez · 05-04-2007, 09:34 AM

I have the same problem.

I replaced the rotors, brake pads, calipers, bearings, hoses, balanced and rotated..........and it still pulsates, the steering wheel rocks back and forth, the truck shakes (violently sometimes) and it pulls slightly.

I am in a bind.....

mudseeker · 05-04-2007, 03:51 PM

Quote:

Originally Posted by gmctrucks

Are the pins that hold the caliper lubed also maybe the calipers are binding maybe rust rebuilt them or buy new ones. Hope this helps.

yes i wire wheeled the junk off the pins and lubed them before i installed them. i also used an air hose and blew the pistons out of their bores and besides some minor flakes and black brake fluid the bores were clean. i also chipped about an inch of rust off the spindles and cleaned the dust shield because i could here scraping when i turned the rotors without the calipers on.

you know, for the life of me i can't remember if it has ABS, if so it is probably RWAL only.

no i have not turned the rotors yet, just replaced the shoes so far. i'm going to wait for him to get the tires balanced first and go from there. if that does not help i will try isolating the problem like you suggested skylark

FORSUREFIX · 05-05-2007, 02:05 AM

check rear axles,one of the axles may be slightly bent,have some one follow behind you,if axle is bent it will look like the wheel is loose from behind.im just guessing,but i had a camaro with a bent axle that had the kind of pedal feel that your describing.

GR8wht2000GMC · 05-05-2007, 07:58 AM

it will go away when you have the rotors turned. mine was the same way with all the symptoms. the rotors may look perfect, but it doesnt take much to get that wheel shake goin'

05-03-2007, 07:00 PM	#1
mudseeker mod-o-tator Join Date: Feb 2006 Location: michigan Posts: 4,525	brake pedal pulsation i'm trying to fix my sisters fiances truck. when you go to stop, the pedal litteraly pushes up on your foot about 3 inches. i replaced the front hoses that were about to rust in two and turned the rotors, yet i still pulsates. i jacked the front end back up and checked the hubs agian and still no play in them. the only thing i can think of is the rims need balancing, since i noticed the rims had no balancing weights. any help would be nice since i have never felt a pedal move like this. edit:1991 chevy k1500 regular cab __________________ member map add yourself alldatadiy why is it, when i push one for english, i still can't understand the person on the other end?

05-03-2007, 10:08 PM	#2
Chevy808 Senior Member Join Date: Nov 2006 Location: Born & raised in Hawaii had to move to Salt Lake City...bummer Posts: 275	How's the brakes in the rear? Maybe the front is stopping the whole truck without any help from the rear. Just a thought. __________________ '85 Oldsmobile 442 '93 Chevy 2WD C1500 350 Silverado Extended Cab Shortbed '95 Chevy 4WD K2500 454 Silverado Extended Cab Long Bed

05-04-2007, 04:57 AM	#3
mudseeker mod-o-tator Join Date: Feb 2006 Location: michigan Posts: 4,525	forgot about that part. i replaced the shoes in the rear also, the shoes on the driver side were pretty wore down. i still want to say it is the rims but the front end doesn't shake while going down the road. the pedal pulsates no matter how much force you use on the pedal. i do not feel any play or movement in the steering while trying to stop either. it has 285 tires on it with no lift but torsion bars may be cranked up, also has lack of power steering assist if that helps out any. __________________ member map add yourself alldatadiy why is it, when i push one for english, i still can't understand the person on the other end?

05-04-2007, 08:50 AM	#6
436'd skylark Senior Member Join Date: Mar 2007 Location: Buffalo Ny Posts: 629	Did you have the drums turned? Any way, take a pair of pinch pliers and put them on each brake hose one at a time and go for a ride. once you pinch the hose (effectivily disabling the brakes) and the pulsation goes away you'll know where the pulsation is coming from. __________________ Joe 89 K2500 Chevy, Wee-Oh-five 285K miles, completly rebuilt needs a motor, bad 1962 IHC Scout All Wheel Drive (Scout speak for locking axles) 152 ci, dana everything else

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05-04-2007, 08:24 AM	#4
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 1,970	Are the pins that hold the caliper lubed also maybe the calipers are binding maybe rust rebuilt them or buy new ones. Hope this helps.

05-04-2007, 08:36 AM	#5
75K30 Senior Member Join Date: Jul 2006 Posts: 2,636	Does that thing have ABS?

05-04-2007, 09:34 AM	#7
nnunez Senior Member Join Date: Dec 2005 Posts: 307	I have the same problem. I replaced the rotors, brake pads, calipers, bearings, hoses, balanced and rotated..........and it still pulsates, the steering wheel rocks back and forth, the truck shakes (violently sometimes) and it pulls slightly. I am in a bind.....

05-05-2007, 02:05 AM	#9
FORSUREFIX Full Member Join Date: May 2007 Posts: 12	check rear axles,one of the axles may be slightly bent,have some one follow behind you,if axle is bent it will look like the wheel is loose from behind.im just guessing,but i had a camaro with a bent axle that had the kind of pedal feel that your describing.

05-05-2007, 07:58 AM	#10
GR8wht2000GMC Full Member Join Date: Jan 2007 Posts: 17	it will go away when you have the rotors turned. mine was the same way with all the symptoms. the rotors may look perfect, but it doesnt take much to get that wheel shake goin'

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