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Old Jan 18th, 19, 07:44 PM   #1 (permalink)
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70 Touchy Brakes (real touchy)

I picked up a 70 RS a while back and finally getting around to driving it. First time out I almost bit the steering wheel. This rascal will STOP right now. Anyway to soften the brakes up or ides=as why the brakes are so sensitive?
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Old Jan 19th, 19, 04:23 AM   #2 (permalink)
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Re: 70 Touchy Brakes (real touchy)

I assume you have power brakes. I would take a close look at your master cyl. I had an ELC which had a booster with the 1" (manual) master and the brakes were very touchy like you describe. You need to pair the power master 1 1/8" bore with a booster.

Also there is a repro master set which has a rod that is slightly longer then stock. This mostly causes brake dragging, but could be part of the issue. The cure is to grind the rod shorter by about 1/8".
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Last edited by KevinW; Jan 19th, 19 at 01:46 PM.
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Old Jan 19th, 19, 03:35 PM   #3 (permalink)
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Re: 70 Touchy Brakes (real touchy)

Thanks Kevin. Yes, power disc on front. I'll pull the MC and see what it really is.
Seems I read about a similar issue on a 69 and the MCinstalled was actually the wrong one, making it very sensitive.

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I assume you have power brakes. I would take a close look at your master cyl. I had an ELC which had a booster with the 1" (manual) master and the brakes were very touchy like you describe. You need to pair the power master 1 1/8" bore with a booster.

Also there is a repro master set which has a rod that is slightly longer then stock. This mostly causes brake dragging, but could be part of the issue. The cure is to grind the rod shorter by about 1/8".
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Old Jan 28th, 19, 05:23 AM   #4 (permalink)
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Re: 70 Touchy Brakes (real touchy)

You might want to look at the pads also. I had some performance metallic on one of my cars and they would really lock down especially cold. I would "ride the pedal" just to heat them up. Change to regular pads and back to normal.
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Old Jan 28th, 19, 06:25 AM   #5 (permalink)
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Re: 70 Touchy Brakes (real touchy)

Before you shorten the push rod, you can get an approximate idea of how much you need to shorten it by shimming out the master from the booster using some washers. In my case, .030-.050" was enough to get the right feel out of it.
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Old Jan 28th, 19, 09:42 AM   #6 (permalink)
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Re: 70 Touchy Brakes (real touchy)

I would say its the MS. If you have the 1" bore, go to the 1 1/8". I have a 71 with the 1 1/8 and the power brakes are awesome - wilwood 14" rotors and w/6 piston calipers. The brakes feel sensitive but awesome once you get familiar. Stops way better than my ' 99 c5. If they were more sensitive, I may be looking for solutions like you. One thing I would like to mention, higher vacuum increases sensitivity. I needed more vac with my cam so I added a can and it worked well. If the vac was greater - they would certainly be more sensitive. I don't think sensitivity would be effected much by push rod length. If you already have a 1 1/8 - try lowering the vacuum with a regulator or pump.

Last edited by RAK; Jan 28th, 19 at 09:58 AM. Reason: fix err and add more
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