97 F150 Rear Brake Shudder - Need Help
#1
97 F150 Rear Brake Shudder - Need Help
I have a rear vibration/shudder when applying the brake. The drums and shoes have been replaced three times now. Had the last drums turned just in case they were a little outta round even though they were new. Wheel cylinders have been replaced also though not leaking. Checked driveshaft and replaced u-joints. Replaced ABS sensor. Last night installed new brake hardware kit. Still same thing. Seems to get worse as the brakes get hotter. Feel it at all speeds.
This is a 97 F150 Supercab 4x4 with 261K miles.
Anyone out there ever had this issue or have any ideas on how to resolve it?
Any help is very much appreciated!!
This is a 97 F150 Supercab 4x4 with 261K miles.
Anyone out there ever had this issue or have any ideas on how to resolve it?
Any help is very much appreciated!!
#2
Some ideas to throw out.
Over tightening of lug nuts causing drum distortion that would be subject to variation with heat buildup.
Rear spring suspension bushings worn.
Broken spring leaf in the stack.
.
Be sure which end is causing the vibration.
Supporting the rear 'frame' high enough safely, let the rear hang and do an in gear running check to see if the rear will react to repeated braking as hat builds up.
It should stay stable.
.
If the front discs are over tightened it puts a 'wave' in the disc that can result in a pulsation that is also temperature sensitive.
Good luck.
Over tightening of lug nuts causing drum distortion that would be subject to variation with heat buildup.
Rear spring suspension bushings worn.
Broken spring leaf in the stack.
.
Be sure which end is causing the vibration.
Supporting the rear 'frame' high enough safely, let the rear hang and do an in gear running check to see if the rear will react to repeated braking as hat builds up.
It should stay stable.
.
If the front discs are over tightened it puts a 'wave' in the disc that can result in a pulsation that is also temperature sensitive.
Good luck.
#3
#4
#5
This afternoon I had it up on jack stands and just for kicks spun both rear wheels in the forward direction. The passenger side turns freely all the way around. The drivers side turns free about half way around and then it gets tough to turn. As if one of the shoes are sticking or something. Maybe that E brake cable is hanging up? Will check that tomorrow also. Thanks!
#6
If something were to be sticking, it would be happening throughout the whole rotation of the drum. But what you are experiencing is by turning it by hand is being reverberated more when you lay on the brake pedal.
That tells me either 1 of 2 things:
1. Drum is warped.
2. Drum is not centered correctly or not flush with the hub.
I am leaning towards #2.
How thoroughly have you cleaned the areas?
I usually wire brush the heck out of the area before I put on new rotors and drums.
That tells me either 1 of 2 things:
1. Drum is warped.
2. Drum is not centered correctly or not flush with the hub.
I am leaning towards #2.
How thoroughly have you cleaned the areas?
I usually wire brush the heck out of the area before I put on new rotors and drums.
#7
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#8
Some ideas to throw out.
Over tightening of lug nuts causing drum distortion that would be subject to variation with heat buildup.
Rear spring suspension bushings worn.
Broken spring leaf in the stack.
.
Be sure which end is causing the vibration.
Supporting the rear 'frame' high enough safely, let the rear hang and do an in gear running check to see if the rear will react to repeated braking as hat builds up.
It should stay stable.
.
If the front discs are over tightened it puts a 'wave' in the disc that can result in a pulsation that is also temperature sensitive.
Good luck.
Over tightening of lug nuts causing drum distortion that would be subject to variation with heat buildup.
Rear spring suspension bushings worn.
Broken spring leaf in the stack.
.
Be sure which end is causing the vibration.
Supporting the rear 'frame' high enough safely, let the rear hang and do an in gear running check to see if the rear will react to repeated braking as hat builds up.
It should stay stable.
.
If the front discs are over tightened it puts a 'wave' in the disc that can result in a pulsation that is also temperature sensitive.
Good luck.
Wentr ahead and drove it some the last couple days and it seems to be getting worse. In fact at certain speeds I feel a rear vibration without pressing the brake. But when I do press the brake it gets much worse. Took it to two different shops this week and explained the issue and told the!
#9
[QUOTE=4bigdonjr;5173829]Leaf springs and bushings all check OK. Put the rear up on stands today and all seems stable. Lug nuts are all torqued to 100 ft lbs.
Wentr ahead and drove it some the last couple days and it seems to be getting worse. In fact at certain speeds I feel a rear vibration without pressing the brake. But when I do press the brake it gets much worse. Took it to two different shops this week and explained the issue and told them what I have done thus far and they both said not to leave it with them!! HaHa. /QUOTE]
Wentr ahead and drove it some the last couple days and it seems to be getting worse. In fact at certain speeds I feel a rear vibration without pressing the brake. But when I do press the brake it gets much worse. Took it to two different shops this week and explained the issue and told them what I have done thus far and they both said not to leave it with them!! HaHa. /QUOTE]
#10
If something were to be sticking, it would be happening throughout the whole rotation of the drum. But what you are experiencing is by turning it by hand is being reverberated more when you lay on the brake pedal.
That tells me either 1 of 2 things:
1. Drum is warped.
2. Drum is not centered correctly or not flush with the hub.
I am leaning towards #2.
How thoroughly have you cleaned the areas?
I usually wire brush the heck out of the area before I put on new rotors and drums.
That tells me either 1 of 2 things:
1. Drum is warped.
2. Drum is not centered correctly or not flush with the hub.
I am leaning towards #2.
How thoroughly have you cleaned the areas?
I usually wire brush the heck out of the area before I put on new rotors and drums.
#11
#12
You have now proven it is brake related when you apply and vibration gets worse.
My bet is one or both front discs have a wave in them.
When the disc comes around to bring the wave in between the pads, the friction increases then goes way until the next revolution.
This effect can be sensitive to heat.
Cool discs the pulsating may be light, braking makes it worse because your forcing the wave to traverse an even tighter pad condition, heat build up can make it worse or better..
Good luck.
My bet is one or both front discs have a wave in them.
When the disc comes around to bring the wave in between the pads, the friction increases then goes way until the next revolution.
This effect can be sensitive to heat.
Cool discs the pulsating may be light, braking makes it worse because your forcing the wave to traverse an even tighter pad condition, heat build up can make it worse or better..
Good luck.
#13