Too Slow '90

Is the only difference between power and non power the booster?

Easy Mike

No. Power and standard brake master cylinders are also different. There is also specific hardware used in the power brake set up not needed for standard brakes.

Lupigiato

Easy Mike, I will be converting my 68 to PS over this winter, and looking at the PS Conversion Kits that vendors offer, the list of parts does not include a different master cylinder or a booster. I know there are STD and power versions sold individually, so I'm wondering if I need to buy a new cylinder and a booster? As a point of reference, click on this link and at the bottom select kit components. I know some folks refer to this setup as a "slave",

http://www.zip-corvette.com/ProductD...L2-SR&CTitle=&

Brcmpbl

The thread is about brakes, not steering. Mike is saying the master cylinder etc is different for power brakes than for manual brakes. This is in no way related to power steering of course. You won't obviously need a brake master cylinder and booster to make you power steering conversion operational.

gbvette62

The factory used a different master cylinder, for power and non power brake cars. The difference I believe was the size of the MC's piston bore.

I have been "told" that you can safely, use the non power MC, when converting to power brakes. Personally, I think if your going to the trouble of upgrading to power, you might as well replace the master cylinder, while you have everything apart. A new generic master cylinder runs about $100, and the repro Delco's go for about $150.

The attaching points on the firewall, are different for the booster, than they are for the master cylinder. To mount the booster, you need to add new holes, which can be "tricky" with the dash installed.

You'll also need new brake lines, from the MC to the brass distribution block.

Lupigiato

well that's just a huge embarrassment on my part!!! I know the difference between the two systems, but can only say in my defense that I must've had a stroke when I read and wrote my post. Holy mackerel!!! I digress and will find somewhere to hide.

7T1vette

Nah. Just start a new thread on P/S.

Too Slow '90

Thanks for the detail. I may be pulling the dash anyway but then again I may look at a different system.

Easy Mike

You meant well, Lupi. Merry Christmas.

doorgunner

Thanks Mr. L.......

not only did this rookie learn how to convert to P/B.....

but also learned how to apologize with style!

noonie

Manual masters are 1" dia bore and power are 1-1/8" bore, mounting holes/pattern the same.
Depending on which way you are going, you may be able to reuse the lines.

New masters are around 50 bucks at most parts stores.

Too Slow '90

Bill,

It's for a '68 I just purchased.

Roy

Lupigiato

LOL!

Lupigiato

Thanks for the pass Easy.

68/70Vette

There's a modification required to the firewall also to mount up the PB master cylinder.

For my 70 I bought Stainless Steel Brake Corporations aluminum MC. Little pricey.

I converted my 70 to a Hydroboost and used the SSBC MC. Also I replaced my brake and clutch parts on the passenger's side of the firewall....a difficult job made much easier by removing the steering column. Working under the dash is just sooooo muuucccchhh fun.

TheSkunkWorks

I would strongly advise having an AIM on hand for converting either to or from manual brakes. BTW, another item to bear in mind is the pushrod clevis hooks up to a different hole in the pedal arm for the linkage.

loup68

Isn't the push rod a different length between standard and power brakes? Lou.

mariobro

This is the first thing I did when I bought my 72 earlier this year.

parts bought.
-New Master cylinder with booster
-New brake light switch arm

The push rod on the brake pedal gets relocated up higher on the pedal arm and the new brake light switch bolts in the lower hole where the push rod was connected to.

Had the dash out as getting to the top hole to mount the brake booster is a pain. I did have to drill the new mounting holes for the brake booster.

I used all the existing lines that were ran to the manual master cylinder.

TheSkunkWorks

Yes. And, before you ask how long is the manual one, I'm afraid I didn't think to measure back when...

edk136

Here's a push rod for manual brakes