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  #1  
Old 10-05-2007, 09:31 AM
CHEROKEE66 CHEROKEE66 is offline
 
Join Date: Mar 2005
Location: GILBERTSVILLE PA
Posts: 20
Default Brake Return springs

I have seen it mentioned several times about having a spring return on the brake pedals. What tension or strength and length do they require? I am sure someone has done their homewok that did this and I would appreciate any info.
Thanks George Z
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  #2  
Old 10-05-2007, 10:09 AM
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LifeofReiley LifeofReiley is offline
 
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Location: Round Rock, TX
Posts: 3,773
Default Parts List

RV Brake Spring Parts List

I used the following from McMaster Carr
www.mcmaster.com/

(1) Pkg 6389K625
Nylon Bearing Flanged, for 3/8" Shaft Dia, 1/2" Od,
3/8" Length, Packs of 5 $1.97 Pkg

(1) Pkg 9657K115
Steel Compression Spring Zinc-Plated Spring-Tempered, 3"
L, 1/2" Od, .047" Dia, Packs of 12 $5.29 Pkg

(4) Ea. 9946K13
Aluminum Set Screw Shaft Collar 3/8" Bore, 3/4"
Outside Diameter, 3/8" Width $1.82 EA.

for a total cost of about $19.62 with shipping.
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Last edited by Mike S : 10-05-2007 at 12:04 PM. Reason: corect URL
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  #3  
Old 10-05-2007, 08:44 PM
CHEROKEE66 CHEROKEE66 is offline
 
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Location: GILBERTSVILLE PA
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Default

Thanks for the info, this is a great source of information.
George Z
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  #4  
Old 10-05-2007, 10:08 PM
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briand briand is offline
 
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Location: Grand Rapids MI
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If I understand correctly; the Cleveland master cylinders require the springs but the Matco's do not.

I could be wrong.
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  #5  
Old 10-06-2007, 02:56 AM
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Rene Bubberman Rene Bubberman is offline
 
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Location: Delft, the Netherlands
Posts: 216
Default Matco needs 'em too

Here's a picture of the set-up: http://websites.expercraft.com/PHVII...y&log_id=19304

Better install them when the brakes are still easily accessable
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PH-VII | RV-7 | tip-up | FADEC
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http://websites.expercraft.com/PHVII/

PH-RVP | RV-7A | slider
Flying | 5 hours
http://websites.expercraft.com/phrvp/
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  #6  
Old 10-06-2007, 04:01 PM
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Mike S Mike S is offline
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Default

Quote:
Originally Posted by briand View Post
If I understand correctly; the Cleveland master cylinders require the springs but the Matco's do not.

I could be wrong.
You have it backwards.

Matcos and Clevelands both have return springs, however the Matco has them internal and the Clevelands have them external...

But for some reason, the Matco units sometimes need a little extra, so a second spring can be added to the exposed shaft.

I have had both apart, side by side, and the main area I can see that might cause the problem is the "Free play" at the end of the return stroke. The Matcos have very little, and the Clevelands have close to a quarter inch of free play.
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  #7  
Old 10-07-2007, 03:59 PM
painless painless is offline
 
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Location: Peshtigo, Wisconsin
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Default

I just did this installation as a retro fit, and had no trouble adding the springs while under the panel.

Regards,
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RV6A N782P
Peshtigo, WI
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  #8  
Old 11-17-2007, 11:44 AM
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jlfernan jlfernan is offline
 
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Default

How far down the shaft should the collar be? I'm looking for the best ompromise between peformance and pedal travel. Also, once the brake system is full, how much pedal travel should you have?
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Jorge Fernandez
Spruce Creek, FL
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  #9  
Old 11-17-2007, 12:05 PM
painless painless is offline
 
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Default

My collars are about 3/4" from the top attach point of the master cylinders. This seems to give me enough tension to return the pedals to neutral with enough authority. No need to over do it, but your foot will compensate for any over loading of that spring IMHO.

As far as pedal travel, you really need to get a feel for the resistance you have in the brake. If you feel that it is spongy and has excessive travel, then you have air in the line somewhere. Once you bleed those lines, you should feel firm resistance to pedal application after about 2"of deflection...at least that is what I am getting.

Hope this helps
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  #10  
Old 11-17-2007, 04:26 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Default Are you sure?

Quote:
Originally Posted by painless View Post
Once you bleed those lines, you should feel firm resistance to pedal application after about 2"of deflection...at least that is what I am getting.
Two inches is a huge amount of peddle travel for the brake peddles in any RV.
If the system is working properly with no air in it anywhere, the peddle travel should be more on the order of 3/4 inch maximum travel at the top of the peddle. That's been my experience anyway, with the dozen or so RV's I have worked on.
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