From smokey at railops.com  Sat Feb  7 13:17:03 2026
From: smokey at railops.com (Smokey Culver)
Date: Sat, 07 Feb 2026 20:17:03 +0000
Subject: [Oletrucks] Brake pedal
Message-ID: <em22557568-c4e0-49a1-8e7d-4882878c3e8b@railops.com>

May be a silly question, but...  I have after-market disc brakes on my 
1950 3600.  Recently redid the rear ones and all is working well.  But 
when I press the brake pedal down to stop or slow down, it stays engaged 
and I have to release it with the toe of my boot.  Is there a spring 
that I missed?  Any thoughts?

Thanks!

Smokey Culver
League City, Texas
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/oletrucks/attachments/20260207/94f40e73/attachment.htm>

From miq at bigllama.com  Sat Feb  7 17:25:43 2026
From: miq at bigllama.com (MIQ MILLMAN)
Date: Sat, 7 Feb 2026 16:25:43 -0800
Subject: [Oletrucks] Brake pedal
In-Reply-To: <em22557568-c4e0-49a1-8e7d-4882878c3e8b@railops.com>
References: <em22557568-c4e0-49a1-8e7d-4882878c3e8b@railops.com>
Message-ID: <CAASF5jF6ONcBDkYbKq5jU6socpGSH=A+T4YHXYWnjXT8+vwtkA@mail.gmail.com>

Smokey didn't you swap out the master cylinder a couple months ago?  Maybe
you have air in the lines, or need to bench bleed the replacement master
cylinder-- this would cause the pedal to go to the floor.
Hydraulic pressure should push the pedal back up in a boosted system.  I'm
guessing that since you swapped to disc brakes, this would be the case?

That said there is a spring that connects the lever arm to the frame the
link below is for Jim Carter's site:

https://oldchevytrucks.com/meb113.html

  --Miq

On Sat, Feb 7, 2026 at 12:21?PM Smokey Culver <smokey at railops.com> wrote:

> May be a silly question, but...  I have after-market disc brakes on my
> 1950 3600.  Recently redid the rear ones and all is working well.  But when
> I press the brake pedal down to stop or slow down, it stays engaged and I
> have to release it with the toe of my boot.  Is there a spring that I
> missed?  Any thoughts?
>
> Thanks!
>
> Smokey Culver
> League City, Texas
> _______________________________________________
>
> Oletrucks at autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $11.47
> Archive: http://www.team.net/pipermail/oletrucks
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/oletrucks/miq at bigllama.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/oletrucks/attachments/20260207/bc64d55d/attachment.htm>

From bill_hanlon at comcast.net  Sun Feb  8 07:42:08 2026
From: bill_hanlon at comcast.net (Xfinity Email)
Date: Sun, 8 Feb 2026 08:42:08 -0600 (CST)
Subject: [Oletrucks] Brake pedal
In-Reply-To: <CAASF5jF6ONcBDkYbKq5jU6socpGSH=A+T4YHXYWnjXT8+vwtkA@mail.gmail.com>
References: <em22557568-c4e0-49a1-8e7d-4882878c3e8b@railops.com>
 <CAASF5jF6ONcBDkYbKq5jU6socpGSH=A+T4YHXYWnjXT8+vwtkA@mail.gmail.com>
Message-ID: <363332876.988860.1770561728851@connect.xfinity.com>

Smokey:  I'm replying directly to you because I'm not sure attachments will go through the oletrucks mail list.
 
As Miq says, there is a pedal return spring, item 4.5970 in the GMC parts manual shown here.  There is also a "brake return spring extension",  item 4.5815.  It is just a straight piece of heavy spring wire with a hook bent on both ends.   Both are shown in the Jim Carter link that Miq posted.
 

> On 02/07/2026 6:25 PM CST MIQ MILLMAN <miq at bigllama.com> wrote:
>  
>  
> Smokey didn't you swap out the master cylinder a couple months ago?  Maybe you have air in the lines, or need to bench bleed the replacement master cylinder-- this would cause the pedal to go to the floor.  Hydraulic pressure should push the pedal back up in a boosted system.  I'm guessing that since you swapped to disc brakes, this would be the case?
>  
> That said there is a spring that connects the lever arm to the frame the link below is for Jim Carter's site:
>  
> https://oldchevytrucks.com/meb113.html
>  
>   --Miq
> 
> On Sat, Feb 7, 2026 at 12:21?PM Smokey Culver <smokey at railops.com mailto:smokey at railops.com> wrote:
> 
> > May be a silly question, but...  I have after-market disc brakes on my 1950 3600.  Recently redid the rear ones and all is working well.  But when I press the brake pedal down to stop or slow down, it stays engaged and I have to release it with the toe of my boot.  Is there a spring that I missed?  Any thoughts?
> >  
> > Thanks!
> >  
> > Smokey Culver
> > League City, Texas
> > _______________________________________________
> > 
> > Oletrucks at autox.team.net mailto:Oletrucks at autox.team.net
> > Donate: http://www.team.net/donate.html
> > Suggested annual donation  $11.47
> > Archive: http://www.team.net/pipermail/oletrucks
> > 
> > Unsubscribe/Manage: http://autox.team.net/mailman/options/oletrucks/miq at bigllama.com
> > 
> _______________________________________________
> 
> Oletrucks at autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $11.47
> Archive: http://www.team.net/pipermail/oletrucks
> 
> Unsubscribe/Manage: http://autox.team.net/mailman/options/oletrucks/bill_hanlon at comcast.net
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/oletrucks/attachments/20260208/69bff4a4/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 132558 bytes
Desc: not available
URL: <http://autox.team.net/pipermail/oletrucks/attachments/20260208/69bff4a4/attachment-0001.png>