Help identify intermittant front end knocking that stops if brakes are applied..
#1
New Member
Thread Starter
Help identify intermittant front end knocking that stops if brakes are applied..
2006 roadster.
I have a front-end knocking which is clearly heard as 1 knock per wheel revolution. This happens on every drive, but you never know when it will begin. Today it happened around 20mph so I pulled over and stopped. When I resumed driving, the knock had stopped. The knock is quite loud; loud enough that most people would pull off the road to investigate.
Might be worthwhile to know I just replaced the rotors and pads. I thought I did a pretty good job and torqued everything correctly but I still had a local shop go behind me and check my work. They took it apart and put it back together and said everything looked perfect. They torqued the wheels to 98 lbft. I find it odd this starts right after a brake job but I also had a camshaft sensor go bad immediately afterwards also so it's not necessarily related.
Has anybody experienced something like this? I'm at the end of my rope with what this could be.
I have a front-end knocking which is clearly heard as 1 knock per wheel revolution. This happens on every drive, but you never know when it will begin. Today it happened around 20mph so I pulled over and stopped. When I resumed driving, the knock had stopped. The knock is quite loud; loud enough that most people would pull off the road to investigate.
Might be worthwhile to know I just replaced the rotors and pads. I thought I did a pretty good job and torqued everything correctly but I still had a local shop go behind me and check my work. They took it apart and put it back together and said everything looked perfect. They torqued the wheels to 98 lbft. I find it odd this starts right after a brake job but I also had a camshaft sensor go bad immediately afterwards also so it's not necessarily related.
Has anybody experienced something like this? I'm at the end of my rope with what this could be.
Last edited by Justin35; 06-10-2023 at 10:08 AM.
#3
New Member
Knock
2006 roadster.
I have a front-end knocking which is clearly heard as 1 knock per wheel revolution. This happens on every drive, but you never know when it will begin. Today it happened around 20mph so I pulled over and stopped. When I resumed driving, the knock had stopped. The knock is quite loud; loud enough that most people would pull off the road to investigate.
Might be worthwhile to know I just replaced the rotors and pads. I thought I did a pretty good job and torqued everything correctly but I still had a local shop go behind me and check my work. They took it apart and put it back together and said everything looked perfect. They torqued the wheels to 98 lbft. I find it odd this starts right after a brake job but I also had a camshaft sensor go bad immediately afterwards also so it's not necessarily related.
Has anybody experienced something like this? I'm at the end of my rope with what this could be.
I have a front-end knocking which is clearly heard as 1 knock per wheel revolution. This happens on every drive, but you never know when it will begin. Today it happened around 20mph so I pulled over and stopped. When I resumed driving, the knock had stopped. The knock is quite loud; loud enough that most people would pull off the road to investigate.
Might be worthwhile to know I just replaced the rotors and pads. I thought I did a pretty good job and torqued everything correctly but I still had a local shop go behind me and check my work. They took it apart and put it back together and said everything looked perfect. They torqued the wheels to 98 lbft. I find it odd this starts right after a brake job but I also had a camshaft sensor go bad immediately afterwards also so it's not necessarily related.
Has anybody experienced something like this? I'm at the end of my rope with what this could be.
#4
New Member
iTrader: (6)
Anti rattle clips were installed incorrectly. Have them re-check their work. Take the tech for a teat drive first. Unless you went to a brake shop. Those techs are basically McDonald's quality employees and shouldn't really even be called techs.
Last edited by i8acobra; 06-11-2023 at 05:33 AM.
#5
New Member
Thread Starter
Thanks for the replies so far.
I'm having "the best mechanic in town" take a look tomorrow morning.
In the off-chance that someone on this forum might know what looks right and what looks fishy, I will post some pics I just went out and took. FYI, these are StopTech Street rotors and pads bought from Tirerack.com.
Last edited by Justin35; 06-11-2023 at 03:14 PM.
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khnitz (06-13-2023)
#6
New Member
iTrader: (4)
Outside of brake fitment/install issues, bad wheel bearing, something rubbing your rims (like improperly routed brake lines), or a really out of balance rim/tire, I can't think of anything else rotation related that could be causing the knocking sound up front. BUT, you may have a suspension knock/sound that could be conflated with the wheels rotating. Just to be sure, you've ruled out engine accessories? Like AC Compressor, Alternator, PS Pump?
If you've ruled out the brake/wheel assembly and engine accessories, then I suspect it's suspension related since it's not always there. You mentioned this happens on every drive, but will start randomly. Check out your compression rod bushings. These are known to fail and produce a knocking sound.
Cheers!
-Icer
If you've ruled out the brake/wheel assembly and engine accessories, then I suspect it's suspension related since it's not always there. You mentioned this happens on every drive, but will start randomly. Check out your compression rod bushings. These are known to fail and produce a knocking sound.
Cheers!
-Icer
#7
New Member
Thread Starter
Outside of brake fitment/install issues, bad wheel bearing, something rubbing your rims (like improperly routed brake lines), or a really out of balance rim/tire, I can't think of anything else rotation related that could be causing the knocking sound up front. BUT, you may have a suspension knock/sound that could be conflated with the wheels rotating. Just to be sure, you've ruled out engine accessories? Like AC Compressor, Alternator, PS Pump?
If you've ruled out the brake/wheel assembly and engine accessories, then I suspect it's suspension related since it's not always there. You mentioned this happens on every drive, but will start randomly. Check out your compression rod bushings. These are known to fail and produce a knocking sound.
Cheers!
-Icer
If you've ruled out the brake/wheel assembly and engine accessories, then I suspect it's suspension related since it's not always there. You mentioned this happens on every drive, but will start randomly. Check out your compression rod bushings. These are known to fail and produce a knocking sound.
Cheers!
-Icer
As for your recommendations, if the aforementioned fix doesnt work ill check into those but the sound is clearly coming from the front wheels.
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#8
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iTrader: (4)
Hi Justin,
I always put a little caliper grease between the back of my pads and caliper fingers/pistons. This should not cause a problem, I do it to prevent high-frequency vibration or brake whine/squeal. Now the orange stuff looks like "CRC Brake Quiet" to me, not grease. Brake quiet hardens up like RTV and makes removal/cleanup a pain in the butt. I personally don't like to use it, and for most modern vehicles equipped with pad shims, it's not required.
Cheers!
-Icer
I always put a little caliper grease between the back of my pads and caliper fingers/pistons. This should not cause a problem, I do it to prevent high-frequency vibration or brake whine/squeal. Now the orange stuff looks like "CRC Brake Quiet" to me, not grease. Brake quiet hardens up like RTV and makes removal/cleanup a pain in the butt. I personally don't like to use it, and for most modern vehicles equipped with pad shims, it's not required.
Cheers!
-Icer
#9
New Member
Thread Starter
Hi Justin,
I always put a little caliper grease between the back of my pads and caliper fingers/pistons. This should not cause a problem, I do it to prevent high-frequency vibration or brake whine/squeal. Now the orange stuff looks like "CRC Brake Quiet" to me, not grease. Brake quiet hardens up like RTV and makes removal/cleanup a pain in the butt. I personally don't like to use it, and for most modern vehicles equipped with pad shims, it's not required.
Cheers!
-Icer
I always put a little caliper grease between the back of my pads and caliper fingers/pistons. This should not cause a problem, I do it to prevent high-frequency vibration or brake whine/squeal. Now the orange stuff looks like "CRC Brake Quiet" to me, not grease. Brake quiet hardens up like RTV and makes removal/cleanup a pain in the butt. I personally don't like to use it, and for most modern vehicles equipped with pad shims, it's not required.
Cheers!
-Icer
#10
New Member
iTrader: (4)
Hi Justin,
A little bit of play or movement of the pad ears laterally inside the caliper bracket is perfectly normal. This slight movement is immediately taken care of as soon as you apply brake pressure and won't happen again unless you change the rotational direction of your brake rotors (braking in reverse). My Brembo brakes do this the 1st time I brake in reverse and then again when I start moving forward. All you hear is a subtle click of the pads as they set in the bracket. This does not cause a repeat knocking sound.
I really don't think your brakes are the issue and I would hate to see you throw the parts canon at this without proper diagnosis.
Cheers!
-Icer
A little bit of play or movement of the pad ears laterally inside the caliper bracket is perfectly normal. This slight movement is immediately taken care of as soon as you apply brake pressure and won't happen again unless you change the rotational direction of your brake rotors (braking in reverse). My Brembo brakes do this the 1st time I brake in reverse and then again when I start moving forward. All you hear is a subtle click of the pads as they set in the bracket. This does not cause a repeat knocking sound.
I really don't think your brakes are the issue and I would hate to see you throw the parts canon at this without proper diagnosis.
Cheers!
-Icer
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