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<div style="font-size: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;"> <span style="font-family: helvetica; font-size: 12pt;">Smokey: I'm replying directly to you because I'm not sure attachments will go through the oletrucks mail list.</span>
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<div class="default-style" style="font-size: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;"> <span style="font-family: helvetica; font-size: 12pt;">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.</span>
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<div class="default-style" style="font-size: 12pt; font-family: helvetica,arial,sans-serif; color: #333333;"> <span style="font-family: helvetica; font-size: 12pt;"><img class="aspect-ratio" style="max-width: 100%;" src="cid:d0d707c83e704ccd98e0e79e694d7789@open-xchange.com" alt=""></span>
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On 02/07/2026 6:25 PM CST MIQ MILLMAN <miq@bigllama.com> wrote:
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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?
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That said there is a spring that connects the lever arm to the frame the link below is for Jim Carter's site:
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<div> <a href="https://oldchevytrucks.com/meb113.html">https://oldchevytrucks.com/meb113.html</a>
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--Miq
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On Sat, Feb 7, 2026 at 12:21 PM Smokey Culver <<a href="mailto:smokey@railops.com">smokey@railops.com</a>> wrote:
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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?
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Thanks!
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Smokey Culver
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League City, Texas
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