Brake pads moving: ok to track?
#1
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Brake pads moving: ok to track?
Just replaced my rear pagid RS29's.. and the guide holes seem larger causing the pads to move on the pins (see the attached video). Applying and releasing the brake you can hear the backing plate strike the guide pin.
Am I right to assume this is fine on track as the pad will simply hit the guide pin almost immediately under braking and then work as normal?
Road test and the car stops fine.. just odd that identical pads would have a materially different tolerance.
Thanks
Matty
Am I right to assume this is fine on track as the pad will simply hit the guide pin almost immediately under braking and then work as normal?
Road test and the car stops fine.. just odd that identical pads would have a materially different tolerance.
Thanks
Matty
#5
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Thread Starter
#6
Raises eyebrow - that does not look right. It seems it would hammer the pins with repeated use.
Grain of salt, zero experience with P-car brakes, but in the experience I have with Brembo and Stoptech 4 piston calipers I've never seen pads that want to move up and down like that due to the fit between the pad backing plate and the opening of the caliper. Could the pads be the wrong size?
-Mike
Grain of salt, zero experience with P-car brakes, but in the experience I have with Brembo and Stoptech 4 piston calipers I've never seen pads that want to move up and down like that due to the fit between the pad backing plate and the opening of the caliper. Could the pads be the wrong size?
-Mike
#7
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Looks like an incorrect pad size to me. How do they compare with the old pad, size wise?
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#8
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He said quite common depending on caliper-pad combination and sometimes an identical pad from a different production run will fit differently.
Apparently no safety or performance concern.. just noisy at low speeds.
#10
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I don't see any concerns with the pads moving that much. It's not uncommon to see size variation in pad backing plates across brands, particularly with race compounds. Some brands run smaller or larger than others, and they can vary by a couple millimeters in some dimensions.
The only real negatives would be:
A) A thumping or knocking sound when the pads move from one end of the caliper to the other and make contact...clunk! This would likely be most pronounced when going from forward to reverse or vice versa, so don't let it scare you when it happens...it will happen!
B) If there are no abutment plates (the flat area in the caliper where the ends of the pads contact the caliper), the hard steel backing plate could over time wear the aluminum of the caliper a bit. In our AP Racing calipers for example, we have stainless steel abutment plates to resist that wear. Many OEM calipers just allow the pads to make contact with the aluminum caliper body.
Overall though, there's nothing in that video that should cause serious concern.
The only real negatives would be:
A) A thumping or knocking sound when the pads move from one end of the caliper to the other and make contact...clunk! This would likely be most pronounced when going from forward to reverse or vice versa, so don't let it scare you when it happens...it will happen!
B) If there are no abutment plates (the flat area in the caliper where the ends of the pads contact the caliper), the hard steel backing plate could over time wear the aluminum of the caliper a bit. In our AP Racing calipers for example, we have stainless steel abutment plates to resist that wear. Many OEM calipers just allow the pads to make contact with the aluminum caliper body.
Overall though, there's nothing in that video that should cause serious concern.
__________________
'09 Carrera 2S, '08 Boxster LE (orange), '91 Acura NSX, Tesla Model 3 Performance, Fiesta ST
Jeff Ritter
Mgr. High Performance Division, Essex Parts Services
Essex Designed AP Racing Radi-CAL Competition Brake Kits & 2-piece J Hook Discs
Ferodo Racing Brake Pads
Spiegler Stainless Steel Brake Lines
704-824-6030
jeff.ritter@essexparts.com
'09 Carrera 2S, '08 Boxster LE (orange), '91 Acura NSX, Tesla Model 3 Performance, Fiesta ST
Jeff Ritter
Mgr. High Performance Division, Essex Parts Services
Essex Designed AP Racing Radi-CAL Competition Brake Kits & 2-piece J Hook Discs
Ferodo Racing Brake Pads
Spiegler Stainless Steel Brake Lines
704-824-6030
jeff.ritter@essexparts.com
#13
Rennlist Member
I don't see any concerns with the pads moving that much. It's not uncommon to see size variation in pad backing plates across brands, particularly with race compounds. Some brands run smaller or larger than others, and they can vary by a couple millimeters in some dimensions.
The only real negatives would be:
A) A thumping or knocking sound when the pads move from one end of the caliper to the other and make contact...clunk! This would likely be most pronounced when going from forward to reverse or vice versa, so don't let it scare you when it happens...it will happen!
B) If there are no abutment plates (the flat area in the caliper where the ends of the pads contact the caliper), the hard steel backing plate could over time wear the aluminum of the caliper a bit. In our AP Racing calipers for example, we have stainless steel abutment plates to resist that wear. Many OEM calipers just allow the pads to make contact with the aluminum caliper body.
Overall though, there's nothing in that video that should cause serious concern.
The only real negatives would be:
A) A thumping or knocking sound when the pads move from one end of the caliper to the other and make contact...clunk! This would likely be most pronounced when going from forward to reverse or vice versa, so don't let it scare you when it happens...it will happen!
B) If there are no abutment plates (the flat area in the caliper where the ends of the pads contact the caliper), the hard steel backing plate could over time wear the aluminum of the caliper a bit. In our AP Racing calipers for example, we have stainless steel abutment plates to resist that wear. Many OEM calipers just allow the pads to make contact with the aluminum caliper body.
Overall though, there's nothing in that video that should cause serious concern.