Jump to content

Where to install quick release valve.


Trenton
 Share

Recommended Posts

Hi folk,

I need to install the airlines and quick release valve for the front brakes on my b61. Where should I install the quick release valve? The guy at the parts store told me that it needs to be located some place where both airlines to the chambers will be the same length. The only place I can see where that would be possible would be on the firewall under the windshield washer motor. Where are they normally installed on a b model MACK?

I Appreciate any help you can give me.

Trenton

Sent from my iPad using Tapatalk HD

Link to comment
Share on other sites

If memory serves me correctly, they used to be mounted somewhere on the front crossmember.

Then run synflex lines to bulkhead fittings on each side of the frame by each front wheel then flexible rubber hoses to the chambers.

Ron

I drilled and mounted mine on the front rad support with plumbing as you stated.

Link to comment
Share on other sites

Yep pretty much all truck makers mount the front axle qr2 on the crossmember forward of the axle. I have seen some mounted on radiator brackets and one bolted to a bumper before but the crossmember is oe style and probably the safest bet. Make sure you run equal length lines from each side if one is longer the short side will activate faster and the long side will release slower and you'll get brake drag and possible control issues on slick roads.

"Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin

"If your gonna be STUPID, you gotta be TOUGH"

"You cant always get what you want, but if you try sometimes you get what you need"

Link to comment
Share on other sites

they don't have to be equal length and never were on a B model. on a B model they were mounted on the driver side between the fuel tank brackets inside the frame rail. if there was a front wheel brake control valve it was mounted here in place of a quick release valve to limit the air to the front brakes in inclimate weather. from here the line for the pass side ran backwards, around the cab mount crossmember then down the pass inside frame rail to a bulkbead fittin that went thru the rail and connected to a rubber hose then the brake can. the driver side ran down the left inner frame rail, under the steerin box and into a bulkhead fitting. most B models I have seen up here in New England have the front wheel control valve instead of a quick release valve to limit the air. same deal on air lines except the front wheel control valve version had another line that runs back to the flipper switch on the dash. there should already be two pre drilled holes from the factory to mount the valve between the fuel tank bracket bolt holes on the driver side inner frame rail.

post-6-0-64947600-1408238925_thumb.jpg

Link to comment
Share on other sites

You're right Matt,

the "B" models we had all had front brake limiting valves on them, our early "F" models had them also.

I know on the "F" models they were mounted on a bracket that was welded to the radiator support.

And now that you mention it you're right about where they were mounted on a "B" model, it's been a long time ago!

Ron

Link to comment
Share on other sites

You're right Matt,

the "B" models we had all had front brake limiting valves on them, our early "F" models had them also.

I know on the "F" models they were mounted on a bracket that was welded to the radiator support.

And now that you mention it you're right about where they were mounted on a "B" model, it's been a long time ago!

Ron[/quote

I haven't ever messed with the brakes on a B but I did take a Bendix air brake class and they said brake lines were to be equal length for the brakes to apply and release in sync. I always wondered if they took into account lack of grease and old springs when they got into their specs, but equal length lines does make sense for an air system. I'll bet engineering that far in depth wasn't even thought of when they started building B models, the times they have a changed fur sure.

"Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin

"If your gonna be STUPID, you gotta be TOUGH"

"You cant always get what you want, but if you try sometimes you get what you need"

Link to comment
Share on other sites

It's interesting to read that MACK installed them on the drivers and ran the right side airline around the back of the cab. The airlines would be far from equal length with that set up. I took the earlier advice and have mounted my quick release/limiting valve on the front cross member.

Thanks for the input.

Trenton

Sent from my iPad using Tapatalk HD

Link to comment
Share on other sites

It's interesting to read that MACK installed them on the drivers and ran the right side airline around the back of the cab. The airlines would be far from equal length with that set up. I took the earlier advice and have mounted my quick release/limiting valve on the front cross member.

Thanks for the input.

Trenton

Sent from my iPad using Tapatalk HD

Hey if thats all thats changed in the last 60+ years were good, LOL!

  • Like 1

"Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin

"If your gonna be STUPID, you gotta be TOUGH"

"You cant always get what you want, but if you try sometimes you get what you need"

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...