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  #11  
Old 07-09-2018, 01:34 PM
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Quote:
Originally Posted by ramos291 View Post
If you were to put on a salvaged car's brake booster what car would work on 61 thunderbird? I am using a 7" booster when I converted to disc front. That 7" booster is not doing the job. Thought would try a 9".
You leave a lot of important information out of your description of your system.

Thunderbirds came with disk brakes, starting in 1965. Is your booster a two-stage or single stage? In other words, was it designed for disk or drum brakes? Squarebirds use the two-stage booster because there is no more room to fit a booster diameter larger than 10". The OEM drum booster IS 10" but it is barely adequate for drum brakes. I've already gone over this.

What bore size is your M/C?
Did you use a combination proportioning valve?
What disk system did you buy?
Did you replace your brake lines and hoses?

Let's see pictures of your system. - Dave
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  #12  
Old 07-09-2018, 10:53 PM
ramos291 ramos291 is offline
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What bore size is your M/C?
Did you use a combination proportioning valve?
What disk system did you buy?
Did you replace your brake lines and hoses?
The kit was from Auto city classic. MC is from 82 corvette. Yes I am using combo prop valve.
No I didn't replace brake lines but I did replace caliper hoses. What size brake lines should be used? My bird is a 61 tja t had power drum brakes original. The booster I'm trying to use is suppose to be an 8" single stage. Wish I could figure out how to share pictures.
Quote:
Originally Posted by simplyconnected View Post
You leave a lot of important information out of your description of your system.

Thunderbirds came with disk brakes, starting in 1965. Is your booster a two-stage or single stage? In other words, was it designed for disk or drum brakes? Squarebirds use the two-stage booster because there is no more room to fit a booster diameter larger than 10". The OEM drum booster IS 10" but it is barely adequate for drum brakes. I've already gone over this.

What bore size is your M/C?
Did you use a combination proportioning valve?
What disk system did you buy?
Did you replace your brake lines and hoses?

Let's see pictures of your system. - Dave
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  #13  
Old 07-10-2018, 12:03 AM
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YellowRose YellowRose is offline
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Default 9" Brake booster

Randy, when you became a member on this Forum a good number of years ago, it was explained to you in the New Members Welcome Forum how to post pix on this Forum. To save you from having to find the post to you back then, here is the information that was posted to you that you need to know regarding how to post pix here.

As a Paid Member if you have anything you want to share with us you can post attachments directly on our server. To become one, have a PayPal account and click on the Donate to Site button at the top right of this Forum. To post attachments as an unpaid user you can create an account on one of the free picture hosting websites, upload your pictures of your Tbird there and post the link to them in Our Rides Forum. Or you can send them to me, Ray Clark ~ YellowRose, John Pizzi ~ jopizz, or Dave Dare, our webmaster ~ simplyconnected and we will post them for you. When you post pictures please set them for 800x600 size for better viewing on the Forum.
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http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm
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  #14  
Old 07-10-2018, 08:48 AM
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Quote:
Originally Posted by ramos291 View Post
...The kit was from Auto city classic. MC is from 82 corvette. Yes I am using combo prop valve.
No I didn't replace brake lines but I did replace caliper hoses...
Now we're getting somewhere. It's easy to understand why your performance is really poor.

The prop valve is good and so are your new hoses. What calipers are you using? Are they single or dual piston?

I live in the 'rust belt' so I will not trust 50 year-old steel brake lines. I've had too many spring a leak. The last OEM system leak happened in winter, 2 miles from home when I was sitting at the drive-thru window at a fast food place. My pedal slowly sunk to the carpet as I was waiting for my food in my Escort. And yes, it was rainy and cold. Called the flatbed.

Your M/C should have a one-inch bore. Not sure what size you have? Unbolt it and measure the bore. Many M/C's will allow you to do this without disconnecting hydraulic lines.

Brake lines are commonly 3/16". We use the same brake line for modern metric systems as well.

If a single stage 10" booster is barely adequate for drum brakes, a single stage 8" is miserably small for disk brakes. - Dave
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  #15  
Old 07-13-2018, 11:41 PM
ramos291 ramos291 is offline
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Default a number of years ago

thanks for your valid points.
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