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Does anyone know where to find detailed instructions/directions/suggestions for rebuilding the clutch and brake pedal assembly on a '66 Mustang?
 

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There is a schematic at page 267 of the book Mustang 64 1/2 -70 restoration guidepublished by motorbooks international.
 
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That's like asking instructions on getting to the Moon !!!!!
 

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There's not really much to it once you have the support removed from the car. Removing the support is easy if the steering box/shaft is out. If it is in the car (the steering column) it would be best to dissasemble pedals in car. To do this just remove the pin from the brake master cylinder rod and remove the rod from brake pedal, also remove switch from pedal by sliding off-you may want to unplug switch first. Keep note on order of any plastic spacers you may find. Next I would remove the pin which secures the through firewall rod which connects the clutch pedal to equalizer bar. Watch out now as the underdash spring can now shoot the clutch pedal against the firewall rather harshly and quickly. You know need to remove the spring from under the dash which attaches to the clutch arm and back to support, you can do this by prying or by removing the three bolt up forward that attach the front bracket which attaches to the support and holds the spring-you may want to have the steering column tube removed or at least dropped (do this by removing the two screws which secure it to dashboard) to give you more room.Once the spring is off, look up under the dash to the right (passenger side) of pedals and pedal support, there will be a pin or large E clip that holds the clutch pedal rod from passing back through the brake pedal/support, pull the clip/pin, and now the clutch pedal can be slid out the left side, the brake pedal will now fall out, as the clutch pedal's rod is all that holds it in.To remove the support itself, undo the four 9/16" headed bolts at firewall (two of them secure brake master cylinder, the other two are just below) from the engine bay side. From the inside of car drop the steering column by removing the two 1/2" socket size nuts-if you haven't already.These two nuts attach to the studs which secure the front of the support to dashboard, sometimes the studs themselves will come out with nut. All that remains now are one or two 3/8'"socket size self tapping screws that hold the support to firewall from inside the car, look up at firewall area and you should see them. With these removed the support should be able to be swung to the side and removed. To rebuild the set up you can go several ways depending on how bad your support is, if the bushings have failed ages ago and the clutch pedal rod/arm has cut through bushings in support, you have a few options: 1} obtain a new repo support 2} find a used support- automatic cars use the same support and almost never wear out 3} fix your old support- by the new bushing insert and have your old support welded up 4} send your old support out and have roller bearings installed. If you were lucky and your support and metal bushing were fine, all you need are the 4 new plastic bushing for the clutch pedal rod- two of which go into the upper brake pedal arm and two that go into the metal bushing on support. The plastic bushings can be had from the repo parts houses-they are the same ones used in the automatic shifter bases. Be sure to also get the new bushing for the firewall rod end that goes into the clutch pedal and new spring insulators for where the return spring ends mount.Just reassembly with plenty of grease-I use white lithium, and reverse procedure, and detail as go-paint etc. Hope this isn't to long and answers your question.
 
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