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#1
06-13-2026, 07:49 PM
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Manual Master Cylinder Bleeding 69 GTO/Lemans
Pleading ignorance but could/should/can the master cylinder be bench bled with the hold off valve as pictured or just the master alone? I'm in uncharted territory here as this is part of my front manual drum to disc brake conversion, and my drum brake setup didn't have the holdoff.
Thanks for helping. |
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#2
06-14-2026, 09:39 PM
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Well, the assembly is mounted in the car. Bled the master per instructions. I guess nobody has dealt with this so I'll wing it.
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#3
06-14-2026, 11:01 PM
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Wish I could answer your question, but I don’t know. Been viewed 116 times. Hopefully someone can answer this. Good luck.
__________________
1964 Tempest Custom 421 SD clone KRE 74cc heads KRE 230°/236° hydraulic roller cam Rebuilt 3.23 rear end |
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#4
06-15-2026, 01:08 PM
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I've replaced the master cylinder twice that I can remember in my 69 but I never removed the hold off valve. Just bench bled the new master and then bled the rest of the system. Check the service manual on the bleeding process with the hold off valve.
__________________
If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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#5
06-15-2026, 08:14 PM
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I have an old original 69 service manual but didn't find anything about this. Maybe it's just part of the line bleeding process. I'll find out tomorrow when I start bleeding the brakes. Probably going to be an adventure chasing leaks, with all new front disc brakes, lines, master, etc. Thanks.
Last edited by 433lemans; 06-15-2026 at 08:23 PM. |
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#6
06-20-2026, 07:02 PM
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I heard or read somewhere that you're supposed to hold that little black button in while bleeding the brakes for that line(front I think). If I'm wrong, someone please correct me.
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#7
06-21-2026, 02:18 PM
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Bench bleed without the hold-off valve then install and bleed system.
__________________
1967 Firechicken, 499", Edl heads, 262/[email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule. |
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#8
06-21-2026, 02:21 PM
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/\ /\ /\ Did it this way yesterday. It worked.
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#9
06-21-2026, 04:31 PM
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Congratulations!
__________________
If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
| The Following User Says Thank You to VCho455 For This Useful Post: | ||
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#10
07-05-2026, 09:18 PM
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Finally wrapping up my front end overhaul. Most everything torqued, greased, etc. Also replaced the pitman seal in the steering sector. After bleeding the brakes, I'm pretty happy with them. Replaced the original master cylinder with a Leed unit. Took a while to stop the leaks in the new lines but am good to go now. Now the whole front suspension and brakes are "as new", only now with disc brakes! Front end alignment coming up.
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