Shep69 149 Report post Posted May 27, 2021 Does anyone know what the size of the rear 9 inch drum brake cylinders are on a 69 351 mach1 . There’s a few different sizes to choose from . 13/16, 7/8 and 29/32 . Quote Share this post Link to post Share on other sites
Brian Conway 264 Report post Posted May 27, 2021 From the 69 Shop Manual; 1 Shep69 reacted to this Quote Share this post Link to post Share on other sites
Shep69 149 Report post Posted May 27, 2021 8 hours ago, Brian Conway said: From the 69 Shop Manual; Thanks Brian . So it’s 7/8 . Quote Share this post Link to post Share on other sites
EastYorkStang 63 Report post Posted May 29, 2021 Could you not measure the existing units ? Quote Share this post Link to post Share on other sites
Mach1 Driver 560 Report post Posted May 30, 2021 He probably doesn't want to take it apart until he has the new ones in hand- that's the way I would do it. 2 Shep69 and RPM reacted to this Quote Share this post Link to post Share on other sites
Shep69 149 Report post Posted May 30, 2021 On 5/29/2021 at 10:32 AM, EastYorkStang said: Could you not measure the existing units ? Yes I wanted to know what size is correct before pulling it apart. I found that I had 13/16 in there . I purchased the 7/8 cylinders and put them in on the weekend. I thought this would have made a big improvement in my brakes but it didn’t make much difference at all. Ive just about replaced all the brake system now including master, vacuum booster front callipers pads and new seals and spring in the valve block and proportional valve. Have about 15 “ vacuum at idle . Still not great braking . Quote Share this post Link to post Share on other sites
Brian Conway 264 Report post Posted May 30, 2021 I guess I am missing something ? Looking at the spec's, 351 Mustang, seems you should be running 10" drums and shoes ? Brian Quote Share this post Link to post Share on other sites
pgold 2 Report post Posted May 31, 2021 Shep69 have you tried EBC redstuff disk pads. Made a considerable improvement to my brakes. cheers Paul. Quote Share this post Link to post Share on other sites
Shep69 149 Report post Posted May 31, 2021 8 hours ago, pgold said: Shep69 have you tried EBC redstuff disk pads. Made a considerable improvement to my brakes. cheers Paul. No I haven’t but have heard good things about them. Might be worth giving them a go. Quote Share this post Link to post Share on other sites
pgold 2 Report post Posted June 1, 2021 Shep, I ordered mine from Richmond Brake and Clutch in Melbourne 03 9853 2113. No stock in Brisbane at the time. Pads to suit VT Commodore callipers fitted to my 69 $137.45 delivered to Brisbane. Much cheaper than EBAY. They may be closed with the covid 19 lock down at present. DP31158C may be the pads you need. 1 Shep69 reacted to this Quote Share this post Link to post Share on other sites
Shep69 149 Report post Posted June 2, 2021 On 6/1/2021 at 10:44 AM, pgold said: Shep, I ordered mine from Richmond Brake and Clutch in Melbourne 03 9853 2113. No stock in Brisbane at the time. Pads to suit VT Commodore callipers fitted to my 69 $137.45 delivered to Brisbane. Much cheaper than EBAY. They may be closed with the covid 19 lock down at present. DP31158C may be the pads you need. Thanks for the info Paul. Quote Share this post Link to post Share on other sites