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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

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  #1  
Old 06-20-2011, 12:16 PM
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1954 Transmission or Brakes locking up?

So I was driving my 1954 this weekend and after the vehicle is warmed up about 5-10 miles of driving it feels like something is causing a drag on the Truck.

The truck will no longer roll freely after a few miles of driving, I think either the brakes are locking up due to heat or there is a problem with the transmission.

I have a brake booster under the floor which is close to the exhaust. I have already re routed brake lines and sleeved them in heat resistant fabric. I am also planning to install a heat shield between booster and exhaust even though I am not sure this is the issue.

Anyone have any experience with anything like this? Any trouble shooting tips?
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Old 06-20-2011, 12:25 PM
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Sounds like maybe yer brakes are adjusted up a little to tight. And heating up when driving. I would try backing them off just a bit. When it is dragging have you went around and felt to see if there is any heat at any of the brakes? If any are hot to the touch than that is the one I would back off first.
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Old 06-20-2011, 12:33 PM
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Hi there Artic

I haven't looked for that symptom but I will do that. I have disc's in the front and drums in the rear. Is it possible the disc's could do this or just the drums?
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Old 06-20-2011, 12:40 PM
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It's more likely that yes it is the disks. My guess is the calipers are sticking. Also have ya checked the trans and diff for gear lube?

Anyway if ya think it may be the calipers than open the bleeders and let the pressure off. If it rolls free till ya use the brakes again than I would think ya found the problem. Sometimes this wont work but it is worth a try.
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Old 06-20-2011, 01:06 PM
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Good Tip Artic

Just curious...if it ends up being the caliper....would that mean I need new Calipers or is there an adjustment somewhere
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Old 06-20-2011, 01:48 PM
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Depends on the caliper. If it's a single piston and the caliper floats on the mounting pin then you may need to grease up the pin they float on.

If it's a multi-piston and the caliper is stationary, like the Wilwood 4 piston where the caliper is mounted centered on the disc rotor, then the problem may be a residual valve.

You say you have disc/drum combo. You say the MC still under the floorboards with a booster there. Did you use residual valves? If so, are you sure you have the right size for the disc? The disc is blue (2lb) and the drum is red (10 lb). You don't need them for each wheel. Only for each axle.
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Old 06-20-2011, 02:15 PM
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Good Morning Grizz

I am using a Camaro Single piston Caliper. I am using the Blue(2lb) valves in the front. 1 on each wheel, and also 1 Red valve (10lb) going to the rear drums. I am also using a ford Combination Valve like the one listed on this page (1991 Mustang brake valve - Ford Mustang Forums)
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Old 06-20-2011, 02:19 PM
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I think you have one too many valves for the front end. Take one out and put the other before the 'T' union to the front brakes.
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Old 06-20-2011, 02:39 PM
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Thanks Grizz

will give that a shot. Do you know anything about those combination Valves I have used?
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Old 06-20-2011, 03:02 PM
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Only that it looks like it has a proportioning valve built into it so you can adjust the bias between front and rear.

Are you using a dual circuit master cylinder? If so, the larger circuit goes to the front brakes and the smaller one to the rear.
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Old 06-20-2011, 03:03 PM
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I'm with Grizz. The aftermarket suppliers really push the inline residual check valves but they are, in my opinion, often overused and sometimes unnecessary. What is the original application of your master cylinder? If it came from a vehicle that originally had rear drum brakes, then you shouldn't need the 10 lb. valve in the line to the rear and I would remove it. Most master cylinders designed for use with drum brakes will have a residual check valve built in to the master cylinder. Adding another one can cause problems similar to what you are experiencing. The only time you need an inline RPV with drum brakes is when you use a master cylinder for 4-wheel disc brakes and that is true without regard for where the master cylinder is located. And as Grizz mentioned, you ony want one in the line to the front brakes. These things are notoriously "loose" with their specifications and you could have one holding more pressure to one wheel than the other.
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Old 06-20-2011, 04:26 PM
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1954 Transmission or Brakes locking up?

Thank you guys...thats alot of good information

I have the Master that has 2 sized chambers for Disc/Drum Setup. I am going to try and remove those valves and see what happens
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Old 07-07-2011, 04:30 PM
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thanks everyone. I removed the 2 residual valves and it seems to have solved my problem. Not too mention the brakes have a much better feel
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Old 09-19-2011, 12:22 PM
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1954 Transmission or Brakes locking up?

So I thought I had this issue resolved but 2 weeks ago while out for a test ride I had the same issue....brakes locking up to the point that the pads were smoking hot.

I finally figured out what the problem was and am posting just in case anyone has a similar issue.

To summarize I have Mustang II front end with a bracket that lets me install the Grenada rotor with Camaro Calipers. It Turns out part of the casting on the caliper was hitting the mounting bracket not allowing it to seat properly. Calipers bolted on but never felt great since it was tweaked a little. This simple misalignment created alot of drag on the rotor. Well problem is now solved. Just wanted to share if anyone in the future has similar issues
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Old 09-19-2011, 12:22 PM
 
 
 
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