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Re: Excessive disc brake drag? [Re: 68LAR] #1700074
11/18/14 03:27 PM 11/18/14 03:27 PM
Joined: Jan 2003
Posts: 32,930
Grand Prairie,Texas
stumpy Offline
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Grand Prairie,Texas
Sounds pretty normal to me.

Re: Excessive disc brake drag? [Re: 68LAR] #1700075
11/18/14 04:18 PM 11/18/14 04:18 PM
Joined: Jan 2003
Posts: 5,783
Corpus Christi, TX
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Quote:

Quote:

I'm still not sure what you call excessive drag.

Is there some way you can quantify the problem? Can you turn the wheel by hand? Can you spin the wheel without it stopping immediately upon release?



If I spin the wheel with a good hard spin, it will rotate on its own for about one revolution.




that's fairly excessive I would think too....it would cause excess heat and faster wear on the pads/rotor.

I had a similar issue with a bad rubber brake line, have you changed those too?

The Federal Government has not yet learned that you cannot legislate morality 1970 Coronet R/T FF4/FF8/V85/V1G 440/Auto/3.23 1970 Coronet R/T FK5/FK5/V8W/V1W 440/Auto/3.55 1970 Super Bee TX9/TX9/V8W/N96 383/Auto/3.91 1975 Duster 360 VS29L5 Daily Driver
Re: Excessive disc brake drag? [Re: shanker] #1700076
11/18/14 04:52 PM 11/18/14 04:52 PM
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
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Quote:

that's fairly excessive I would think too....it would cause excess heat and faster wear on the pads/rotor.

I had a similar issue with a bad rubber brake line, have you changed those too?




I forgot to mention, I installed brand new rubber brake lines when I did the original conversion about 6 or 7 years ago. Again remember, I had this issue from the onset and the car is driven less than 1K miles a year. Probably closer to around 200 miles/yr..

4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
Re: Excessive disc brake drag? [Re: 68LAR] #1700077
11/18/14 05:05 PM 11/18/14 05:05 PM
Joined: Jan 2003
Posts: 25,796
Rio Linda, CA
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Quote:

If I spin the wheel with a good hard spin, it will rotate on its own for about one revolution.



Sounds better than normal to me.

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Re: Excessive disc brake drag? [Re: John_Kunkel] #1700078
11/18/14 05:40 PM 11/18/14 05:40 PM
Joined: Jun 2014
Posts: 1,325
VA
D
dragon slayer Offline
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VA
Regardless of the age of the calipers if there was any defect in the remanufacture of the piston or some water in the system the corrosion can form and bind the piston. There is no spring return.

I know a B body caliper can be had for $20, so it can be an easy fix. Does the car pull when braking or normal driving? If not, than maybe both are equal which can push you back to a MC piston not fully returning and preventing fluid return, or a meter valve(hold off valve) if you are using one with debris. G
Re: Excessive disc brake drag? [Re: John_Kunkel] #1700079
11/18/14 07:33 PM 11/18/14 07:33 PM
Joined: Jan 2003
Posts: 10,562
Freeport IL USA
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Quote:

Quote:

If I spin the wheel with a good hard spin, it will rotate on its own for about one revolution.



Sounds better than normal to me.



This really doesn't sound like much of a disc brake drag at all to me! Probably better then most! A disc brake drag is where you stop spinning the tire and it stops immediately, or you can barely get it to turn with the wheel.
I think your chasing something you won't be able to cure with disc brakes. Gene
Re: Excessive disc brake drag? [Re: poorboy] #1700080
11/18/14 08:51 PM 11/18/14 08:51 PM
Joined: Jan 2003
Posts: 28,067
Irving, TX
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Irving, TX
Quote:

Quote:

Quote:

If I spin the wheel with a good hard spin, it will rotate on its own for about one revolution.



Sounds better than normal to me.



This really doesn't sound like much of a disc brake drag at all to me! Probably better then most! A disc brake drag is where you stop spinning the tire and it stops immediately, or you can barely get it to turn with the wheel.
I think your chasing something you won't be able to cure with disc brakes. Gene




This is kinda what I had in mind when I read the first post. I asked about the drag but didn't get a quantified answer.

It sounds like his brakes are in great shape and there are no concerns.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
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Re: Excessive disc brake drag? [Re: RapidRobert] #1700081
11/18/14 10:07 PM 11/18/14 10:07 PM
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
R
Rick_Ehrenberg Offline
top fuel
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Posts: 1,688
Marlboro, NY, USA
Quote:

Rick is that correct or not correct that you want the one pad to have some side to side clearance (so it can float)? And the other pad you want to bend the end L tabs so you have to snap it into place on the caliper?



Exactly.

Rick
Re: Excessive disc brake drag? [Re: Rick_Ehrenberg] #1700082
11/18/14 10:20 PM 11/18/14 10:20 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Thanks Rick, you're the man

live every 24 hour block of time like it's your last day on earth
Re: Excessive disc brake drag? [Re: 68LAR] #1700083
11/18/14 10:24 PM 11/18/14 10:24 PM
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
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I'd like to thank everyone for their input. I hope we all learned something, I know I did.

4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
Re: Excessive disc brake drag? [Re: RapidRobert] #1700084
11/18/14 10:33 PM 11/18/14 10:33 PM
Joined: May 2005
Posts: 4,727
Florida
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Florida
Don't mean to be flippant, but at 200 miles/yr, why worry?
Unless they are getting red hot, I wouldn't be concerned.
Re: Excessive disc brake drag? [Re: BDW] #1700085
11/19/14 11:31 AM 11/19/14 11:31 AM
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
68LAR Offline OP
master
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Quote:

Don't mean to be flippant, but at 200 miles/yr, why worry?
Unless they are getting red hot, I wouldn't be concerned.





A good part of that mileage is at the track. I was thinking that I might be leaving some ET on the table with the drag. Maybe I was over thinking the who thing????

4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
Re: Excessive disc brake drag? [Re: 68LAR] #1700086
11/19/14 07:59 PM 11/19/14 07:59 PM
Joined: Jan 2003
Posts: 10,562
Freeport IL USA
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Freeport IL USA
Disc brakes traditionally have more drag then drum brakes. Back in the early 70s, some guys used to run the drum brakes with a loose adjustment on non-self adjusting brakes at the drag strip, in an effort to reduce brake drag. Exactly how much difference it actually makes would probably have to be subject to testing. The pursuit of the lowest ET had some guys doing some strange stuff over the years. The question is, how much are you willing to do for how much reduction in the ET? Gene
Re: Excessive disc brake drag? [Re: poorboy] #1700087
11/19/14 08:41 PM 11/19/14 08:41 PM
Joined: Oct 2003
Posts: 4,013
South Park, Pa.
68LAR Offline OP
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South Park, Pa.
Quote:


Disc brakes traditionally have more drag then drum brakes. Back in the early 70s, some guys used to run the drum brakes with a loose adjustment on non-self adjusting brakes at the drag strip, in an effort to reduce brake drag.


I was one of those drag racers..... When I found it harder and harder to stop is when I did the conversion.

4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
Re: Excessive disc brake drag? [Re: Supercuda] #1700088
11/20/14 12:23 AM 11/20/14 12:23 AM
Joined: Feb 2013
Posts: 41
Northern MN
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cedarmachine Offline
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Northern MN
Quote:

Quote:

Check the residuel valve. Most disc systems use a 1-3 lb valve for disc systems



Residual pressure valves are used in some DRUM setups, not disc.



If the master cylinder is lower than the brake calipers, you will certainly need residual pressure valves. That said, stock disc applications shouldn't need them.
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