[Oletrucks] Brake pedal

[Xfinity Email]

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
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