Power Brake booster. 69 RS-SS 350 AT - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old Dec 9th, 13, 04:08 PM Thread Starter
Senior Tech
Ken
 
Join Date: Oct 2007
Location: St. Louis, MO
Posts: 230
Power Brake booster. 69 RS-SS 350 AT

IF I have a slight leak in the booster could I hear it? When? With my foot on the brakes or off? What would be some other symptoms? Is there a test procedure?

IF my front rotors were turned just a tad under "minimum spec" would the calipers adjust, or would I see reduced braking power?

Same question as above but for the rear drums. Rotors and drums are original and I was trying to keep them. We're only talking about 1 or 2/1000s.

Trying to ID braking problem. Rebuilt MC, new pads, new shoes, bled correctly but don't have quite the braking power I would have expected. If I try I can lock up the brakes and skid. With foot on the brake at a stop sign I hear a "hiss" Śmore so when the pedal is going down than when it is a the bottom, but it's still there.

Thanks.
KenFro is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Dec 9th, 13, 04:39 PM
Gold Lifetime Member
Fred
 
Join Date: Nov 2006
Location: Seabeck WA
Posts: 8,375
Re: Power Brake booster. 69 RS-SS 350 AT

Do you know your engine's baseline vacuum? Check it again. Less vacuum now might point to a vacuum leak thereby causing the hiss. Of course if you can hear it from in the car I'll bet you'll find it real fast from under the hood.

One owner 69 Camaro,(yep, bought it new
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe. 3700 lbs. with me in it.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Fred Ficarra is offline  
post #3 of 8 (permalink) Old Dec 9th, 13, 05:04 PM Thread Starter
Senior Tech
Ken
 
Join Date: Oct 2007
Location: St. Louis, MO
Posts: 230
Re: Power Brake booster. 69 RS-SS 350 AT

Thanks. Do you think it would hiss all the time, or just with the brakes applied?
KenFro is offline  
 
post #4 of 8 (permalink) Old Dec 9th, 13, 05:13 PM
Team Member
Jerry
 
Join Date: Aug 2013
Location: Shelton Wa.
Posts: 502
Re: Power Brake booster. 69 RS-SS 350 AT

My 55 only has a hiss when I push the brake.

69 SS/RS
565 BBC
Tremic 6 speed
Dragonfly Jones is offline  
post #5 of 8 (permalink) Old Dec 9th, 13, 06:36 PM
Gold Lifetime Member
Jeff
 
yellow69RS's Avatar
 
Join Date: Jul 2007
Location: Aurora, IL
Posts: 4,960
Send a message via Yahoo to yellow69RS
Re: Power Brake booster. 69 RS-SS 350 AT

A couple of Thousands on the drum dia or rotor thickness shouldn't be an issue for you on your stated problem. I'm not sure where I'd draw the line on my own car but for safety items like brakes I'm not stuck in the 60's or on the original parts. I feel the engineers know better than I when they set the limits and they understand why.

Pedal height where it should be? pedal holds firm and doesn't pump up or fade down when held lightly (like at stop light)? If adjustment is correct I think it's probably a hydraulic issue.

Jeff
yellow69RS is offline  
post #6 of 8 (permalink) Old Dec 10th, 13, 03:23 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,591
Garage
Re: Power Brake booster. 69 RS-SS 350 AT

As suggested, check pedal free play. if not enough, atmospheric valve will be open and a sight hiss may be heard.
Apply the brakes fully, and a hiss will be heard as atmospheric valve opens and allows diaphram to be pulled in by engine vacuum.

Calipers are self-adjusting and caliper should be at a perpendicular angle for a parallel pad contact.

Rear shoes have mininmal contact area due to the new overbore of the drum.
Shoes are designed for the OE diameter to match a new drum diameter.
Bore out the drum and diameter changes - think of a 3 inch diameter lid onto a 4 inch diameter bowl. Small contact between the shoe and drum.

A lost art - find an older shop and have them 'arc-turned' the shoes to the new diameter of the drum.
Take both the drum and its shoes and match the shoes to their drum.
Assemble brakes, pull parking brake to center shoes, release brake, tighten adjuster until wheel does not turn, then back up 5 notches. Then adjust parking brake for 6-8 notches at its foot pedal.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - maybe this year, 2019 ...
Everett#2390 is offline  
post #7 of 8 (permalink) Old Dec 10th, 13, 06:05 AM
Senior Tech
Al
 
Join Date: Nov 2002
Location: Vancouver, USA
Posts: 10,511
Re: Power Brake booster. 69 RS-SS 350 AT

It does take a bit of driving for the new front pads to bed in. Should get better with a little time. You can get quite a significant improvement with a more aggressive front pad if you bought basic part house pads.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
BPOS is offline  
post #8 of 8 (permalink) Old Dec 11th, 13, 02:01 PM Thread Starter
Senior Tech
Ken
 
Join Date: Oct 2007
Location: St. Louis, MO
Posts: 230
Re: Power Brake booster. 69 RS-SS 350 AT

Thank you everyone. All good things I'll check. I am unfamiliar with the term "atmospheric valve." What and where is that? Unfortunately the weather is going to get a little ugly here for a while, (7║ here tonight) so it may take some time to get back to you. Appreciate all the ideas.
KenFro is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome