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Forums->Hot Heads Tech Talk->Brake and Clutch pedals

ron37
Brake and Clutch pedals


Helping a guy working on a 38 Dodge pickup. He has it on a later frame, which goes up in front of the cab with the coil spring suspension. This sets the engine higher as to the firewall. He is mounting the brake vacuum chamber, master cylinder and clutch cylinder on the fire wall. His issue is he needs to mount these things high, just under the hood , so he can remove the big hemi valve cover to adjust the valves. This causes an issue with the pedals being about 4 inches or so higher than normal. Does anyone know of any vehicles, car or truck, with longer than standard pedal assemblies. If not we will have to engineer something of an offset pushrod assembly. So thanks for and help.
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on: Sun 14 of Feb, 2021 [17:25 UTC] reads: 729

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ron37
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Re: Brake and Clutch pedals
on: Fri 26 of Feb, 2021 [15:48 UTC] score: 0.00
Well we found that the old GM trucks from the 70's have long pedal assemblies. I'm sure Ford and Mopar probably had the same. Old non-power type also had long pedals as power brakes have a 4 to 1 ratio and non-power had a 6 to 1 or more back when. So that problem is solved with a $10 junkyard part. Thanks for all the ideas.

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hemistude
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Re: Brake and Clutch pedals
on: Tue 16 of Feb, 2021 [15:01 UTC] score: 0.00
> Helping a guy working on a 38 Dodge pickup. He has it on a later frame, which goes up in front of the cab with the coil spring suspension. This sets the engine higher as to the firewall.

I'm sure your friend didn't plan to fail... he just failed to plan. We've all been there!

Here's one idea that might get the brake booster out of the way of the rocker cover. I didn't know anything like this existed until I saw on on "Ant Anstead - Master Mechanic" on Motor Trend TV. Apparently 57 T-Birds use something like this too.

This approach might free up enough head clearance to leave all the pedals in the stock position.

https://powerbrakes.com/pb900-universal/
https://www.hydroboost.com.au/boostertypes.htm
https://techtalk.mpbrakes.com/boosters/remote-mounted-brake-boosters-vacuum-booster

I put one of these on my 53 Studebaker because the under-floor master cylinder wasn't compatible with power brakes and the manual setup wasn't doing the job. I put the booster in the trunk and bent and routed a 3/8" hard steel vacuum line from the engine to the trunk (rubber vacuum hose for "give" at the hookup points.) I then ran a couple of long steel brake lines from the master cylinder to the remote booster and back. There is plenty of room under the truck to mount it. I didn't have a good spot under my car so the trunk was the obvious spot.

It worked like a charm. It took me about 4 hours sweaty August hours to build the lines and install it. Once bled, it resulted in very strong brakes and i kept the "clean" engine compartment look. Before, the Mopar disk/drum brakes were scary weak.

I used the VH-40 model which is a little larger and more powerful than the VH-44 model. It is specifically recommended for disk/drum installations. The VH-44 is for drum/drum. I got mine on Amazon for $150 delivered from Australia (this past July.)

Here's the one I used:
https://www.amazon.com/gp/product/B085LBWMX6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

It looks to be out of Amazon stock right now but they are definitely available elsewhere for more money. I think Covid may be to blame. Australia seem to be somewhat self-isolated. Google search "VH-40 booster".

Or he could go with manual brakes sad.

Maybe this will help.

Dave

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ron37
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Re: Brake and Clutch pedals
on: Mon 15 of Feb, 2021 [21:42 UTC] score: 0.00
We have been looking at that, but questioned if it would make the pedal swing ratio too great. We are thinking of an offset Z shaped rod to make the rod hit lower on the longer pedal arm for a better ratio. It didn't help having a 325 with adjustable rockers, then using the old 241 style chrome valve cover. Being none dimpled, we had to make 1/2" aluminum spacers and add another gasket for the valve covers. Thought I would ask. I'll drop a line when we figure out what to do. We haven't got to the steering yet, which will be power rack and pinion. Keep the fires lit.

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Jack
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Re: Brake and Clutch pedals
on: Mon 15 of Feb, 2021 [15:51 UTC] score: 0.00
How about raising the floor?

I had a similar problem once and made longer pedals and I didn't like how it drove that way.

The other alternative would be to put your master cyls. under the floor, or even on the floor with some racing cylinder assemblies from Wilwood or the likes.


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