Question about 2005 Chevrolet Impala

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2005 Chevy impala brake pedal pulsation with brand new rotors installed

2005 Chevy impala had heavy brake pedal pulsation. Installed new pads and rotors, cleaned face of hubs and wheels, torqued lugs to 90ftlbs and still have brake pedal pulsation.

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  • Al Guzzo Mar 16, 2016

    I bought after market rotors and they had to be cut. another thing sometimes washing the car when the rotors are hot will have a pulsation then when it heats up it goes away, i had that with my 2009 Impala. Did they have pulsation immediately after the brake job, could still be warped a rotor.have then checked at a machine shop Good luck

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  • 29 Answers

Is your ABS working properly? Under heavy braking the ABS should engage and 'pulse' the brakes on/off. It is normal to feel the brake petal flutter or pulse under your foot.

Under light braking there should be no pulsing as the ABS does not engage and you have changed the rotors and pads.

Posted on Nov 19, 2013

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Posted on Jan 02, 2017

yotaguy
  • 232 Answers

SOURCE: pulsation in brake pedal and rear end hops during braking

What happens is if you have a bad front wheel bearing when you brake that wheel will turn in or out,when this happens it throws the four wheel alignment out and since this is a solid rear axle,it's forcing it to flex on the suspension,wich could cause the rear tires to bite on the outside edge of one tire and the inside edge of the other,thats one possible the other would be that the rear brakes are are not slowing the wheels evenly causing the same issue.I saw this problem with a bad front wheel bearing on a Nissan Pathfinder but not as pronouced due to the independent rear suspension. Check the front wheel bearings,which of course will mean getting the calipers off the rotors,and then check for any movement in the rotor,if there is check the hub nut,if it's loose tighten it and check for play in the rotor if there is still play that's going to be caused by a bad bearing.You can check the braking in the rear with a simple spring scale(like the ones used for fishing),with the wheels removed have someone apply enough pedal pressure to just engage the brakes but still allow movement attach the scale hook to a wheel stud and pull until it starts to move and note how many pounds of pressure it takes to move the hub.If it's uneven chech your adjusters and even them if needed and then retest,if still uneven you'll need to bleed them again.As far as the dark black substance in the fluid I would say you may gotten a contaminent in the fluid.Brake fluid gets kind of a rusty reddish residue when it breaks down.If I missed anything or you need clarification don't hesitate to ask I'm home all day.Hope this helps solve your problem.

Posted on May 05, 2009

  • 72 Answers

SOURCE: Front Hub Bearing Torque specs to complete replacement

THE LUG NUT TORQUE SPEC - 140FT/LBS\
CALIPER MOUNT - 80FT/LBS
CALIPER BRACKET 129FT/LBS
AXLE NUT 177FT/LBS

Posted on May 09, 2009

  • 1 Answer

SOURCE: I need torque specs for

torque specs. to a 2001 chevrolet malibu 3.1 engine with also needing head and manifold torque specs. as well.

Posted on Sep 14, 2009

  • 115 Answers

SOURCE: pulsating and vibrating brakes on 2003 chevy express, new pads and rotors

Rust build up is commonly found on the hubs sandwiched by the rotors/hubs

Posted on Sep 05, 2009

  • 4 Answers

SOURCE: parking brake pedal goes to floor

The disc brake pads are NOT used for the parking brake. The parking brake uses mini-drum type shoes inside the rear disc rotor.

Take a look at http://wiki.answers.com/Q/How_do_you_change_the_emergency_brake_pads_on_a_2000_Chevy_1500_Silverado_Pickup

For more info

Posted on Jun 21, 2009

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If the brake pedal pulsates while high speed braking, the rotors are warped/out of round. This can also produce noise as it can cause the caliper to move back and forth. You either have poor quality/cheap parts installed or the parts were installed with improper lube on the slide assemblies and there is dirt/rust causing the pins not to move freely or the pad shims are old and rusted causing the pads to stick and overheat the rotors. Have the brakes inspected for the source of the problem

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2. Remove the wheels with a lug-nut wrench and set them aside. The lug-nut wrench can be found in the trunk of your Chevy Impala.
3. Remove the caliper with a ratchet and use a bungee cord to hang the caliper. Do not let the caliper hang from the brake hose, as the hose might break and cause fluid to leak.

4. Remove the brake caliper bracket from the steering knuckle with a ratchet. Set it aside.

5. Remove the break rotor from the hub. The rotor might require force to be removed; if it does, use a hammer to hit the rotor in the center, where the lug studs are located. Take care not to hit the studs.

6. Remove the new rotor from its packaging and use brake cleaner to remove the grease from the rotor. Grease is applied on the rotor in the factory to inhibit rust during storage.

7. Install the new rotor onto the hub.

8. Install the caliper bracket with new brake pads onto the rotor and fasten it to the steering knuckle. Use a ratchet to tighten the bolts.
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