Dragging brakes

My5ABaby · 04-27-2009, 09:30 AM

Is it normal to hear the front pads dragging while the front end is in the air?

Also, what would cause the pistons in both of my back brakes to not retract fully and drag?

vex · 04-27-2009, 10:02 AM

Quote:

Originally Posted by My5ABaby

Is it normal to hear the front pads dragging while the front end is in the air?

Depends. It's not going to behave as though it doesn't have brakes on it. It will drag a little bit, but should be very easy to move by hand. The drag coefficient of the brakes are not big enough to slow the car while moving.

Quote:

Also, what would cause the pistons in both of my back brakes to not retract fully and drag?

That would probably be the "ratcheting" ability of the rear brakes. As the rear pads get lower, the parking brake incrementally adds additional pressure (not really pressure, but height to the piston) to allow the emergency break to function properly.

In other words if you can turn the wheels by hand, you're fine. If they're dragging more than that you're not fine.

My5ABaby · 04-27-2009, 10:56 AM

The left right might not be that bad, but it didn't spin that well when in the air. However, the right rear was heating up the rotor substantially while driving.

vex · 04-27-2009, 11:01 AM

Quote:

Originally Posted by My5ABaby

The left right might not be that bad, but it didn't spin that well when in the air. However, the right rear was heating up the rotor substantially while driving.

Then something is wrong with the caliper to the proportioning valve. Check to make sure you have even wear on the rear pad, maybe even double check the caliper for proper action. Remember you'll have to screw-in/rotate the piston to have it retract. Also double check to make sure you have all the springs installed, etc.

I'm just guessing but what may have happened is that the spring got lost some where and when you pulled the e-brake the brakes were never reset by the force of the spring. Just a thought and probably not what actually happened.

My5ABaby · 04-27-2009, 11:18 AM

Springs are there. I manually retracted the piston and it didn't drag, but after hitting the brakes once it started dragging again.

vex · 04-27-2009, 11:35 AM

Quote:

Originally Posted by My5ABaby

Springs are there. I manually retracted the piston and it didn't drag, but after hitting the brakes once it started dragging again.

Then it's definitely applying too much pressure and retaining that pressure. Try bleeding out your brakes, if that doesn't work you may need to rebuild that caliper.

My5ABaby · 04-27-2009, 12:05 PM

I've bled them a couple times so that shouldn't be a problem. I'm getting replacement calipers/rotors (since they're currently 23 years old) so hopefully that will help. Thanks for the help.

vex · 04-27-2009, 12:26 PM

Hope it is your caliper. If you're still having problems start checking your proportioning valves.

My5ABaby · 04-27-2009, 12:30 PM

Quote:

Originally Posted by vex

Hope it is your caliper. If you're still having problems start checking your proportioning valves.

When I figure out what that is, I'll check it.

vex · 04-27-2009, 12:41 PM

http://www.rotorwiki.com/images/6/6c/11_braking.pdf
25/67 gives you info on how to check it and what it is.

Shadow24v · 04-27-2009, 10:48 PM

not to hi-jack but my FC has a similar issue, it doesn't seem to affect driving at the moment, but the fronts are hard to turn by hand when its jacked up. thats AFTER a 600 mile trip on a tow dolly (rear end on the dolly, fronts rolling). I might be looking into remaned calipers if it doesn't clear up

04-27-2009, 09:30 AM	#1
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	Dragging brakes Is it normal to hear the front pads dragging while the front end is in the air? Also, what would cause the pistons in both of my back brakes to not retract fully and drag? __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

04-27-2009, 10:56 AM	#3
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	The left right might not be that bad, but it didn't spin that well when in the air. However, the right rear was heating up the rotor substantially while driving. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

04-27-2009, 11:18 AM	#5
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	Springs are there. I manually retracted the piston and it didn't drag, but after hitting the brakes once it started dragging again. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

04-27-2009, 12:05 PM	#7
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 2,377 Rep Power: 20	I've bled them a couple times so that shouldn't be a problem. I'm getting replacement calipers/rotors (since they're currently 23 years old) so hopefully that will help. Thanks for the help. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

04-27-2009, 12:26 PM	#8
vex RCC Loves Me Not You Join Date: Jul 2008 Location: Influx. Posts: 2,113 Rep Power: 19	Hope it is your caliper. If you're still having problems start checking your proportioning valves. __________________ The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group

04-27-2009, 12:41 PM	#10
vex RCC Loves Me Not You Join Date: Jul 2008 Location: Influx. Posts: 2,113 Rep Power: 19	http://www.rotorwiki.com/images/6/6c/11_braking.pdf 25/67 gives you info on how to check it and what it is. __________________ The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group

04-27-2009, 10:48 PM	#11
Shadow24v Rotary Fan in Training Join Date: Feb 2009 Posts: 69 Rep Power: 17	not to hi-jack but my FC has a similar issue, it doesn't seem to affect driving at the moment, but the fronts are hard to turn by hand when its jacked up. thats AFTER a 600 mile trip on a tow dolly (rear end on the dolly, fronts rolling). I might be looking into remaned calipers if it doesn't clear up