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Author Topic: brake pedal question  (Read 1472 times)

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Offline rv8air

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brake pedal question
« on: November 01, 2013, 07:33:32 PM »
My kit car project is powered by a 2.3l 76 pinto mated to a t5 trans, with a stock pinto diff wheels and brakes.  My problem is, the stock brake pedal has no upper limit.  It works fine as long as you push down, but sometimes, your foot catches the brake pedal and have to push it back down into place. 

Is there a limiter bracket or pin or something that's supposed to be there, but that I don't have?  Drawings in my Haynes book show no such limiter, but an mustang site shows some pedals with what looks like an upper limit bracket welded to the upper end of the pedal.

why does my pedal not stop where it's supposed to, and how can I fix it so that it does???

Offline jeremysdad

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Re: brake pedal question
« Reply #1 on: November 02, 2013, 01:42:17 AM »
You're missing the steering column. ;)

Drill a hole though the nearest (solid frame) object, tap it (if you have taps), then install a stop (I would use a bolt, were I in your position).

You have to limit the upward travel, or you'll zoop air into your brakes through a (potentially) bad master cylinder gasket. It happens. <It DOES happen... (Ever see a bad 'brake booster'? With a bad MC? Same thing happens with manual brakes and a low pressure weather front...but... I assume everybody else knew that's why you should flush your brake fluid every 24,000 miles, per my 72's owner manual, as well. ;) )) |=}

I think those may have been racing parts that you ref'd. That happens as well. ;;)

Offline rv8air

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Re: brake pedal question
« Reply #2 on: November 02, 2013, 09:35:40 AM »
Thanks for the ideas. I was hoping there was some kind of formed plate that stacked against and traveled with the pedal, but I guess there isn't one.

The piston on the MC has a built-in stop, so isn't the danger with too much travel by the pedal, that the push rod could fall out?  To prevent that, I'd thought of putting a bolt horizontally and forward of the pedal, but it would have to be "just right" the first time.  I like your idea of tapping a spot on the frame, and putting in a bolt.  Since my body is all fiberglass, I'll have find a spot on the pedal mount bracket to do it. 

Offline rv8air

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Re: brake pedal question
« Reply #3 on: November 02, 2013, 10:38:55 AM »
Upon further review...
I took a good long look at the situation configuration.  Instead of tapping for a bolt, an easier solution would be to tuck a u-bolt over my steering column (which is not stock).  The strap, or if necessary, a made-to-fit piece of stock at the bottom of the u-bolt will be my stop.

Although I didn't used your idea of a bolt, you did provide the inspiration for a solution along that track.

thanks!

Offline amc49

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Re: brake pedal question
« Reply #4 on: November 02, 2013, 02:47:20 PM »
Main thing is to make SOMETHING there that works, not finding brake pedal in a hurry can be downright dangerous. I had the same issue when going from MTX to ATX in mine, I made up a bracket that was adjustable to the distance I wanted there. Mine was made up of cobbled together parts so the master cylinder main actuating rod was not clipped into back of master, gassing the car up would make pedal slide back and rod fell out of master. Fun........... .at least I found out the emergency brake worked.