What is normal C4 brake drag?
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,078
Likes: 283
From: Dyersburg TN
What is normal C4 brake drag?
my 1992 had passenger front tire being reinstalled after flat repair causing me to grab rotor by hand to turn (align wheel studs). Just seemed a little tight. car drives with no pull to either side so assume driver front has same level. I expect some drag from pads lightly touching rotors but how do you tell how much is too much?
Safety Car
Joined: Mar 2017
Posts: 4,206
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From: LeClaire Iowa
Hard to describe in a post. But, when my front wheels are off I don't feel any drag whatsoever spinning the rotor. If this is really a concern about how much is too much it would only take me 10 minutes to pull a front tire and take a video of me spinning it. Dan
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,078
Likes: 283
From: Dyersburg TN
prev owner did work on brakes but did not remember when. My last C4 was a bear to bleed brakes. That is why I asked about normal drag rather than going for caliper rebuild.
Melting Slicks
Joined: Aug 2003
Posts: 3,401
Likes: 397
From: Lakeville MI
C4 brakes are of a unique low drag design. The pads (both inner and outer) are retained by the caliper pistons and the caliper bridge by the dual circumferential springs. As brake pressure is released, the (previously) deformed seals pull the pistons back into the caliper along with the inner pad (roll-back). The caliper bridge should be free to float outward pulling the outer pad with it resulting in relatively low drag.
Most brakes allow the pads, pistons, and calipers to simply free float upon pressure release. The C4 brakes are intended to positively retract the pads along with the pistons and caliper bridge and should result in reduced drag and a minor improvement in fuel economy.
High brake drag is an issue.
Most brakes allow the pads, pistons, and calipers to simply free float upon pressure release. The C4 brakes are intended to positively retract the pads along with the pistons and caliper bridge and should result in reduced drag and a minor improvement in fuel economy.
High brake drag is an issue.
Safety Car
Joined: Mar 2017
Posts: 4,206
Likes: 1,325
From: LeClaire Iowa
Thread Starter
Melting Slicks
Joined: May 2003
Posts: 2,078
Likes: 283
From: Dyersburg TN
Safety Car
Joined: Mar 2017
Posts: 4,206
Likes: 1,325
From: LeClaire Iowa
I was going to pull a wheel and try to show how easy my rotor spins. I will if you want. Its raining and I have nothing else to do. Dan
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Thread Starter
Melting Slicks
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From: Dyersburg TN
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If you have an IR temp gun go for a drive and compare the temp of each wheel. If the RF is noticeably hotter than the others then explore further. IIRC most readings will be <200F even after a few hard stops.
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