Bad loud grinding noise passenger front - when braking

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hywy61

Well-known member
May 25, 2004
738
0
atlanta, ga
Going crazy with this problem.

Driving and braking at slow speeds, very little noise. Driving at higher speeds (35 or so) horrible grinding noise when braking hard. Release brake pedal and drive. No noise.

Only happens when braking then goes away when driving. Doesn't happen when i turn corners or anything.

At my wits end with this. I have replaced the brake pads, rotors and caliper. Its still there damnit!!!!

At this point I don't know what else it could be. Any suggestions will be appreciated.

Could sticky caliper guide pins cause this? I didn't replace those but did regrease them. They seems to move ok but not super smooth.
I have some new ones coming next week.
 
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hywy61

Well-known member
May 25, 2004
738
0
atlanta, ga
So when I re -inserted the pins I noticed the bottom one spins as I tighten the caliper bolt. I had to hold it in place with my hand to keep from spinning.

So there is a flat edge to those and I am thinking it has to line up with a flat edge on the caliper. If it striped or worn etc could that cause that loud grinding noise?

I am totally guessing at this point.
 
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hywy61

Well-known member
May 25, 2004
738
0
atlanta, ga
2000 DII with 125K

Wondering now if maybe its the wheel bearing hub. Although i tested for that by grabbing top and bottom of tire and wiggling to check for looseness/play. Nothing.

But after replacing the caliper maybe the added / stronger pressure is moving the rotor more now out of alignment if the bearing is bad. Total speculation.


Might have to give in and take to a real mechanic.
 
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discostew

Well-known member
Sep 14, 2010
7,745
1,026
Northern Illinois
hywy61 said:
2000 DII with 125K

Wondering now if maybe its the wheel bearing hub. Although i tested for that by grabbing top and bottom of tire and wiggling to check for looseness/play. Nothing.

But after replacing the caliper maybe the added / stronger pressure is moving the rotor more now out of alignment if the bearing is bad. Total speculation.


Might have to give in and take to a real mechanic.
Click to expand...

Since you been going round and round with this I would pull the bearing out and spin it in your hand with nothing but the bearing spinning. Hopefully it comes out for you, one trick I do when getting them out when they get rusted in place. Pull the bolts out so there in the bearing by about 4 threads and hit the head of the bolt with a hammer. l also like to dig into the side of the bearing housing with a good and long air hammer bit to drive it out of the knuckle. You don't want to beat on the hub part of the bearing if you might be putting it back in. My guess is that your going to feel some roughness in the bearing when you spin it in your hand.
 
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hywy61

Well-known member
May 25, 2004
738
0
atlanta, ga
Yes.

The three amigos only come around once in a while though. Random times but consistent. Sometimes when braking. Then they go away.

That's been happening on and off for the last year. Before the grinding started. But i am guessing its related?

What's the cost on replacing the hub?
 
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rovercanus

rovercanus

Well-known member
Apr 24, 2004
9,651
246
Hardest part is getting it unstuck. Like Dickso Stew said. Unscrew four bolts then use a hammer to tap out the hub. The axle may or may not drop right out of the hub. If it doesn't it can usually be persuaded with a mallet.
 
helievacpilot

helievacpilot

Well-known member
Mar 29, 2007
960
0
Denver CO
You can only pray it taps out. Mine came from MA, and the son-of-a-bitch was practically welded in from rust. HD air chisel was the only way to break that thing loose. Huge PITA.
 
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hywy61

Well-known member
May 25, 2004
738
0
atlanta, ga
I am in Georgia so rust is not an issue.

Miami Rovers has the part for $194 but doesn't include the ABS sensor. Atlantic British has the part for 2X as much but includes the ABS sensor. I have heard the ABS sensor is rarely the problem.

I guess the only thing i am worried about is if this is not the issue. Dont' know what the hell else it could be.
 
rovercanus

rovercanus

Well-known member
Apr 24, 2004
9,651
246
If it's grinding guaranteed the sensor is toast.
You can always pick up a used one from Will Tillery.
 
helievacpilot

helievacpilot

Well-known member
Mar 29, 2007
960
0
Denver CO
hywy61 said:
Ugggh. I ordered the hub without the sensor. So what happens if I don't replace the sensor?
Click to expand...

I think it's a mistake not to get one without the sensor. Firstly, yours may be toast. Secondly, changing sensors from hub to hub is hit-or-miss. My success rate has been about 50-50. I went with the hub/sensor combo last time.
 
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hywy61

Well-known member
May 25, 2004
738
0
atlanta, ga
So if i do it without changing the sensor what will indicate the sensor is bad?

I guess i thought i could always buy the sensor separately.
 
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hywy61

Well-known member
May 25, 2004
738
0
atlanta, ga
What about buying a used one on ebay? I have seen several out there with the old connector. The new ones don't have the connector, they want it wired directly - which makes me nervous.

I am hoping my original is still fine.
 
rovercanus

rovercanus

Well-known member
Apr 24, 2004
9,651
246
Call Will Tillery.
What I was saying is that if your hub is bad enough to grind, it's bad enough to wipe out the sensor.
I posted a link to a $130 hub. It shows a plug in sensor. Why not try it?
 
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