Greenchevelless
09-26-2016, 12:03 PM
I just put s10 rear brakes on my 70 chevelle. They are 1-7/8 piston size. Im running the factory front disk setup. What master cylinder is recommended? Is the stock 1-1/8" disk/drum master fine to use? Also what do I do about the proporton valve thats under the master cylinder?
This is what describes my current brake system. Ive already bypassed the hold off valve on the frame above the rear end.
"The 1970 disc/drum brake system is interesting.
The stock system had a master cylinder, a proportioning valve for the front discbrakes (http://rd.bizrate.com/rd?t=https%3A%2F%2Fjet.com%2Fproduct%2Fdetail%2F5b de8b9cee99456099c4f36b3e52422b%3Fjcmp%3Dplacse%3Ac nx&mid=297996&cat_id=22000200&atom=10681&prod_id=&oid=6945841897&pos=1&b_id=18&bid_type=8&bamt=2fed68ce8c2e85f1&cobrand=1&ppr=d002bde807c99b97&rf=af1&af_assettype_id=12&af_creative_id=2973&af_id=615103&af_placement_id=1&dv=4c3056dc9aabd9d8a644c96c7b35d9e2), a distribution block, and a hold off valve for the rear drum brakes (http://www.amazon.com/gp/search?ie=UTF8&camp=1789&creative=9325&index=automotive&keywords=rear%2Bdrum%2Bbrakes&linkCode=ur2).
The proportioning valve was mounted next to the master cylinder and its propose was to proportion the amount of fluid that went to the front disk calipers. It did not affect the rear drum system.
The distribution block was mounted on the frame below the master cylinder/power booster. It proposes was to send fluid to the two front calipers (http://clicks.pangora.com/purchaseRedirect.do?p=0&c=636995&o=1365420938&che=cGFuZ29yYSHYl2TZaJMQgfwXArCpB2gH&m=109001&rid=5305865749&ver=2.0&market=us&man=Centric&ser=3467&pc=27655209&pcat=77661&dbob=cGFuZ29yYSEHzlRFOhHqNQ..&dbobcur=USD&abob=cGFuZ29yYSEkm9e5UDkfeQ..&abobcur=USD&ts=MjAxNjA5MjQtMTI0NzA3&op=-1.0&dle=cGFuZ29yYSFukH8DrX5tSNfs5PvzUmmOSGXIqdLmjNk3UZ mqIm57mTge_Y3PVcnlRDStusdyiY_C5tQwLA8Dass_f4slhzk2 m1UDr-yK3Y8AEiBmd8QscmlZjY2XGQRFpoiCx-7sLSsZDlxwi3idRogbTMTUlRrCcBw2vAHEqR-JCEN1rEymNgUR52T_hLvPmwVUTD85pxiWcdT-gwyMsNtydhUJRiQ1k6bGNiQH6T5z6jC-hHby2vKynEWbGHSmEUkVmMKUwAOdNogUF3JeA9bB5CWGzrZYWP Vu-bV0Qo3jXZgNO0Qs-JQQjSutqOlErDlGvXSCu9gjp4vrMIANNbaHXlC8zidBuHtLez6 VR1LtSVNDPgxA_0MarRh553VXqo1iCpc2B6zmndJETnWFLadc0 Uu88I5scKYUor0_K6WGs0Q26YTpqdUYmlLu4TzSS_HWq4KDIF3 nmlgRAEEANqirRM0bx_pCdeAkP1Hwwpp7lYOk_dOQTJioWUb5n SCqCPdROgn0jtzAZMnFOS5pWUb2uG-Md-dS7h1-em7kYVCiKk8xSivU9L3lt-0CUwSlskBFcW0ZBi5vhnwRFgtBnIBIXuVkiB5tb2OsN3tfwQbK r70Xf4caes5vC8v5fWlHCL_qGnfbLCLGUVOSodr1nf5WQWKoFs nLeJGmU7z0OpdrDk_PcGLG5f2wrwJG4M2bwcu0jCoLyG48Pf9W rPTAczhIZwDiMhnY0Fz5kMwicyMBD2c4LRy6_2aa6TAk3Ej45_ 6LVI_sbMa-Zj5c9LWW0id6RBFnuV80KcPpS08DnNxf6i-DqEzLnCoaFTWjQNbBIKqW1CPffjTas3F1RMSbbLC9zQHjC7V1B nH8BAq_NQ0SFZ64h8Rb2B9ATP80qS7ToUeRHCIHkjB06MmpF1B RI3DhNHn2KOWxzF8w4xb4Okyqg2RM-aVacTK2Cmjkx8XP200nqVWOpVOPKv3gBBkdiV0kHSXwImIGS1T XAcA-B9dsijmZlwhu2IhIQqgMC7LOOqps07HFss81ec7u4eS38S9d5b ye9VEJt1RruyMVRraEij4ff1anUvIXBPRJl0Gsn9Utoefm4sMf AO_MfbkU8lCxA9Wy20-blYibjMdOZQdDM316XNrUBzwlbPF1BVXntHH9u3ObWIGtqWz-piLQfkwZW41sONnuXYiB_F9DwvE_E_b578_36lRlqBn0dXxhgS BHUC45WMUDBI_8Jjt0sgV1Mn6gajwbDtEpLQIXC71pgqaH0eta Q-k1VKOfZULIUl2ynMp-MBBx55Z3fMNWK-MS4HSFfCr9FBv60LvZhVgZSevWFlBmU21L9mavUSja6EfckWeL VkDIJE5ESnfjcKP2kpxCaa8o4eBkigR81eY1Q9u9nqHc44dPr4 PV3B-MqK1eIgJTOhB-enY-PB655fXLQJrEoIUwsAVXBXQMssFZw0DdNj2kVpT6FjtRlM6XIX kE3xNar19d3qy1NGSBq6uUHI-2262n3yrF7Gm87EOIfSiSTmhllm6PgnRu4fllaMDeiFuFDR5AM msr7KY6tQ..), and the rear drum wheel cylinders. It also had a valve that sensed a pressure imbalance between the two systems. If such an imbalance occurred it turned an idiot light on, on the dash.
The hold off valve for the rear drum system was mounted on the leading edge of the cross member just above the rear axle. The purpose of this valve was to hold off appling the rear drakes so that you did not get premature lockup on the rearbrakes (http://www.amazon.com/gp/search?ie=UTF8&camp=1789&creative=9325&index=automotive&keywords=rear%2Bbrakes&linkCode=ur2). I believe that this valve was only on the 1970 and that GM fixed the proportioning valve after that year so that the hold off valve was not needed after that"
This is what describes my current brake system. Ive already bypassed the hold off valve on the frame above the rear end.
"The 1970 disc/drum brake system is interesting.
The stock system had a master cylinder, a proportioning valve for the front discbrakes (http://rd.bizrate.com/rd?t=https%3A%2F%2Fjet.com%2Fproduct%2Fdetail%2F5b de8b9cee99456099c4f36b3e52422b%3Fjcmp%3Dplacse%3Ac nx&mid=297996&cat_id=22000200&atom=10681&prod_id=&oid=6945841897&pos=1&b_id=18&bid_type=8&bamt=2fed68ce8c2e85f1&cobrand=1&ppr=d002bde807c99b97&rf=af1&af_assettype_id=12&af_creative_id=2973&af_id=615103&af_placement_id=1&dv=4c3056dc9aabd9d8a644c96c7b35d9e2), a distribution block, and a hold off valve for the rear drum brakes (http://www.amazon.com/gp/search?ie=UTF8&camp=1789&creative=9325&index=automotive&keywords=rear%2Bdrum%2Bbrakes&linkCode=ur2).
The proportioning valve was mounted next to the master cylinder and its propose was to proportion the amount of fluid that went to the front disk calipers. It did not affect the rear drum system.
The distribution block was mounted on the frame below the master cylinder/power booster. It proposes was to send fluid to the two front calipers (http://clicks.pangora.com/purchaseRedirect.do?p=0&c=636995&o=1365420938&che=cGFuZ29yYSHYl2TZaJMQgfwXArCpB2gH&m=109001&rid=5305865749&ver=2.0&market=us&man=Centric&ser=3467&pc=27655209&pcat=77661&dbob=cGFuZ29yYSEHzlRFOhHqNQ..&dbobcur=USD&abob=cGFuZ29yYSEkm9e5UDkfeQ..&abobcur=USD&ts=MjAxNjA5MjQtMTI0NzA3&op=-1.0&dle=cGFuZ29yYSFukH8DrX5tSNfs5PvzUmmOSGXIqdLmjNk3UZ mqIm57mTge_Y3PVcnlRDStusdyiY_C5tQwLA8Dass_f4slhzk2 m1UDr-yK3Y8AEiBmd8QscmlZjY2XGQRFpoiCx-7sLSsZDlxwi3idRogbTMTUlRrCcBw2vAHEqR-JCEN1rEymNgUR52T_hLvPmwVUTD85pxiWcdT-gwyMsNtydhUJRiQ1k6bGNiQH6T5z6jC-hHby2vKynEWbGHSmEUkVmMKUwAOdNogUF3JeA9bB5CWGzrZYWP Vu-bV0Qo3jXZgNO0Qs-JQQjSutqOlErDlGvXSCu9gjp4vrMIANNbaHXlC8zidBuHtLez6 VR1LtSVNDPgxA_0MarRh553VXqo1iCpc2B6zmndJETnWFLadc0 Uu88I5scKYUor0_K6WGs0Q26YTpqdUYmlLu4TzSS_HWq4KDIF3 nmlgRAEEANqirRM0bx_pCdeAkP1Hwwpp7lYOk_dOQTJioWUb5n SCqCPdROgn0jtzAZMnFOS5pWUb2uG-Md-dS7h1-em7kYVCiKk8xSivU9L3lt-0CUwSlskBFcW0ZBi5vhnwRFgtBnIBIXuVkiB5tb2OsN3tfwQbK r70Xf4caes5vC8v5fWlHCL_qGnfbLCLGUVOSodr1nf5WQWKoFs nLeJGmU7z0OpdrDk_PcGLG5f2wrwJG4M2bwcu0jCoLyG48Pf9W rPTAczhIZwDiMhnY0Fz5kMwicyMBD2c4LRy6_2aa6TAk3Ej45_ 6LVI_sbMa-Zj5c9LWW0id6RBFnuV80KcPpS08DnNxf6i-DqEzLnCoaFTWjQNbBIKqW1CPffjTas3F1RMSbbLC9zQHjC7V1B nH8BAq_NQ0SFZ64h8Rb2B9ATP80qS7ToUeRHCIHkjB06MmpF1B RI3DhNHn2KOWxzF8w4xb4Okyqg2RM-aVacTK2Cmjkx8XP200nqVWOpVOPKv3gBBkdiV0kHSXwImIGS1T XAcA-B9dsijmZlwhu2IhIQqgMC7LOOqps07HFss81ec7u4eS38S9d5b ye9VEJt1RruyMVRraEij4ff1anUvIXBPRJl0Gsn9Utoefm4sMf AO_MfbkU8lCxA9Wy20-blYibjMdOZQdDM316XNrUBzwlbPF1BVXntHH9u3ObWIGtqWz-piLQfkwZW41sONnuXYiB_F9DwvE_E_b578_36lRlqBn0dXxhgS BHUC45WMUDBI_8Jjt0sgV1Mn6gajwbDtEpLQIXC71pgqaH0eta Q-k1VKOfZULIUl2ynMp-MBBx55Z3fMNWK-MS4HSFfCr9FBv60LvZhVgZSevWFlBmU21L9mavUSja6EfckWeL VkDIJE5ESnfjcKP2kpxCaa8o4eBkigR81eY1Q9u9nqHc44dPr4 PV3B-MqK1eIgJTOhB-enY-PB655fXLQJrEoIUwsAVXBXQMssFZw0DdNj2kVpT6FjtRlM6XIX kE3xNar19d3qy1NGSBq6uUHI-2262n3yrF7Gm87EOIfSiSTmhllm6PgnRu4fllaMDeiFuFDR5AM msr7KY6tQ..), and the rear drum wheel cylinders. It also had a valve that sensed a pressure imbalance between the two systems. If such an imbalance occurred it turned an idiot light on, on the dash.
The hold off valve for the rear drum system was mounted on the leading edge of the cross member just above the rear axle. The purpose of this valve was to hold off appling the rear drakes so that you did not get premature lockup on the rearbrakes (http://www.amazon.com/gp/search?ie=UTF8&camp=1789&creative=9325&index=automotive&keywords=rear%2Bbrakes&linkCode=ur2). I believe that this valve was only on the 1970 and that GM fixed the proportioning valve after that year so that the hold off valve was not needed after that"