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Joined: Jul 2007
Posts: 8
Grease Monkey
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Grease Monkey
Joined: Jul 2007
Posts: 8 |
INstalled a new power brake from DanChuck. WOW, is it sensitive…..too sensitive compared to other cars. How about a pressure reducer in the vacuum line? Any body doing that or any ideas where to find an appropriate reducer that would work?
Thanks, Ron...39 Sport
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
What does Danchuk suggest? They should know more about the parts they sell than any of us.
How Sweet the roar of a Chevy four!
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The factory power brakes on my 1957 are very sensitive also. Especially at parking lot speeds.
Gene Schneider
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Joined: Dec 2001
Posts: 279
Backyard Mechanic
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Backyard Mechanic
Joined: Dec 2001
Posts: 279 |
There are two things which will cause brake sensitivity.
1 - the master cylinder bore is incorrect in diameter
2 - the brake linings are damp or of poor quality
With the advent of asbestos removal, and now copper, in brake linings, they have become more sensitive to moisture.
I would contact Danchuk to discuss the master cylinder (maybe the one you received was mispackaged) If it is correct, I would take the car for a spin and get the shoes nice and hot (to burn off the moisture) and then verify if the low speed sensitivity was still present.
Oliver J. Giorgi
Technical Advisor
1958 Passenger Car
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Joined: Oct 2013
Posts: 2
Grease Monkey
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Grease Monkey
Joined: Oct 2013
Posts: 2 |
Can anyone advise the correct finish for the 57 Hydrovac booster cylinder shell?
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Joined: Dec 2009
Posts: 47
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Dec 2009
Posts: 47 |
Check Classic Cars magazine.Witin the last 3-5 months, there was a letter on a 57 Chevy having the left front brake dragging.... Seems that there were two clevis pin holes on the top of the 57 (possibly 55,56 and 58) brake pedal pendant to connect the rod from the top of pedal pendant to standard master cylinder, or the other hole to change the travel of the pendant rod to accomodate a Tredal Vac power brake unit...... no mentiuon was made as to which hole to put clevis pin in to change rod's length of travel, top hole or bottom hole.....some of the brake pedal pendant had the two holes.....BUT both standard shiftbrake pendants, and automatic brake pendants, may...or may not have the second hole....power brake pedal pendant on an automatic car had a wider pedal, than the smaller pedal at the bottom of the pendant of a standard shift car !!!!!! joeyk3950 Could affect the "grabiness" of your brakes
Joseph Patrick James Kearney
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Joined: Dec 2009
Posts: 47
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Dec 2009
Posts: 47 |
The booster is grayish steel color...Got ANY literature ANY besides Shop Manual or Assembly manual???? Sales literature mention??? Jim handy film strip and accompanying pamphlet? Anyhing listing bolts,check valve part,tee,clamp part numbers and size,lock washer and bolts for bracket???? I've got a dual four 283 3 speed...... joeyk3950
Joseph Patrick James Kearney
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Joined: Oct 2013
Posts: 2
Grease Monkey
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Grease Monkey
Joined: Oct 2013
Posts: 2 |
I have only the two manuals you mentioned. The cylinder shell is flat gray but I don't know what the finish is made of. Almost looks like gray primer.
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Joined: Feb 2008
Posts: 47
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Feb 2008
Posts: 47 |
Only one hole in the brake pedal for both manual and power brakes. If you have 2 holes a previous owner drilled the second one, not GM.
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