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| problem with rear brakes on Sierra http://auszookers.com/forum/viewtopic.php?f=5&t=32353 |
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| Author: | ChrisRinai [ Sat May 05, 2012 2:34 pm ] |
| Post subject: | problem with rear brakes on Sierra |
hello, i'm having major issues with my brakes ( 1985 Sierra Hardtop ) after replacing everything, as in have no pedal. i have done/replaced: master cylinder front pads seal kits and new pistons in front calipers rear wheel cylinders rear shoes new drums brake bleeding/new fluid the problem is no matter what i do i have no rear brakes, as in the rears don't work but the front does. they have been bled many times, everythings, visually, is as it should be as far as i know. when i lock off/clamp the rear lines ( clamp the rubber sections going over the diff ) the brakes ( fronts ) work fine, have proper pedal etc. as soon as i un-clamp the rears i end up with no pedal again?? anyone have any ideas on what i may have done wrong or what else to do/check?? cheers Chris |
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| Author: | royce [ Sat May 05, 2012 4:20 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
did you adjust them properly? |
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| Author: | ChrisRinai [ Sat May 05, 2012 10:40 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
royce wrote: did you adjust them properly? that's the bit i can't figure out, they seem to be adjusted as far out as possible but dont seem to come out far enough? if that makes sense |
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| Author: | twitchy [ Sun May 06, 2012 6:38 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
I'd re-check the adjustment on the rears & see how you go. You didn't have any bits missing or left over?????? |
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| Author: | Scrawny [ Sun May 06, 2012 7:12 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
My guess is wrong shoes, there's two different sizes. Did you compare them before fitting? If not then compare them now |
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| Author: | SierraDan [ Sun May 06, 2012 7:14 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
Can the different ones even go in? I got the small ones when i needed the big ones once, and it physically wouldnt go one the handbrake/adjuster thing. |
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| Author: | Scrawny [ Sun May 06, 2012 7:19 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
I managed to fit some when I was in hurry once, had the same thing happen |
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| Author: | ChrisRinai [ Mon May 07, 2012 10:19 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
did some mearsurements and it looks like the new drums are too big in internal diameter! the shoes are adjjusted as far out as possible and still dont touch the drums hence the no rear brakes!! how or why i dont know but here is between 8 and 10mm difference between the diameter of the drum and the shoes fully adjusted out. |
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| Author: | Scrawny [ Mon May 07, 2012 1:48 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
Wrong size shoe. There are two different size drum on Sierras, I think they are something 180 and 200mm |
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| Author: | ChrisRinai [ Mon May 07, 2012 4:10 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
i dont think its the shoes, i have the same as what came off. drums measure around 228mm internal diameter and say maximum 230mm, shoes measure at 220mm fully adjusted out as far as they go. |
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| Author: | Scrawny [ Mon May 07, 2012 5:01 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
Have you compared shoes by eye or by placing new and old together? Are the wheel cylinders right? |
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| Author: | ChrisRinai [ Mon May 07, 2012 5:46 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
Scrawn wrote: Have you compared shoes by eye or by placing new and old together? Are the wheel cylinders right? yes and yes, old and new shoes are identical and wheels cylinders are the same as what came off. the only thing we can find nt\ot right is the drum size? |
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| Author: | Scrawny [ Mon May 07, 2012 5:54 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
So you have the bigger drums meant for the bigger shoes then. |
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| Author: | royce [ Mon May 07, 2012 6:02 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
ChrisRinai wrote: new drums are too big in internal diameter! put the old drums on? |
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| Author: | ChrisRinai [ Mon May 07, 2012 6:13 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
i posted all this before we realised the drums could have been wrong!!! old drums were well cactus so got chucked, fingers crossed it'll be sorted tomorrow as i rang the shop that i got all the parts from and it looks like thay have the smaller drums available. it sucks though cause i told them all the info required and they never said anything about there being different sizes of shoes and drums! wouldn't have had all this head f*#k if they had have said to check the sizes or said there were differences |
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| Author: | ChrisRinai [ Wed May 09, 2012 9:26 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
wrong sized drums it was! all sorted now |
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| Author: | cairns27 [ Thu May 10, 2012 5:31 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
I had a hell of a time adjusting the back brakes on my '87 LWB NT. At the end I had to use a screwdriver and lever the shoe out, and the adjuster sprung out and took up the slack. Pedal ok now, but after a drive, one drum is warm, the other cold.I'll pull it apart and adjust it out a bit more. How's it done? Is there an easier way? bye |
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| Author: | 86slowsierra [ Thu May 10, 2012 4:11 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
wtf. arnt all the drums self adjusting? except the handbrake. |
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| Author: | ChrisRinai [ Thu May 10, 2012 4:17 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
once i had the correct parts mine was a piece of piss, the adjusters did their own thing and adjusted up nicely, i just had to close them up to get the drums on then a couple of pumps on the pedal and all was good. brakes feel bloody good now! |
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| Author: | christover1 [ Fri May 11, 2012 9:19 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
86slowsierra wrote: wtf. arnt all the drums self adjusting? except the handbrake. My 1.0 litre LWB did not have self adjusters, until I upgraded to 1.3 brakes. I don't know if other models also didn't have self adjusters. The 1.3 brakes were much nicer, but not as nice as the later disc conversion. |
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| Author: | Scrawny [ Fri May 11, 2012 9:27 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
cairns27 wrote: I had a hell of a time adjusting the back brakes on my '87 LWB NT. At the end I had to use a screwdriver and lever the shoe out, and the adjuster sprung out and took up the slack. Pedal ok now, but after a drive, one drum is warm, the other cold.I'll pull it apart and adjust it out a bit more. How's it done? Is there an easier way? bye Are your brakes full of mud? I'd be stripping them apart and making sure everything works properly. Free up and grease the adjusters. Are all the springs fitted correctly? |
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| Author: | cairns27 [ Sat May 12, 2012 4:36 am ] |
| Post subject: | Re: problem with rear brakes on Sierra |
All brake parts look as new.Springs on right???Took one side off at a time,but everything seemed to work. I just can't see why one side remains cold, not working at all? bye |
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| Author: | jmrc94 [ Sun May 13, 2012 6:22 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
Hello, I need help with the brakes on my '89 Sierra W/T. The handbrake cable appears too long even when fully adjusted. When driving the handbrake lever must be on to make the brake pedal work properly, otherwise it goes to the floor. we put a spacer in the cable the keep tension and now the lever moves only seven clicks but does not work - only makes the pedal brakes work better still. When the handbrake is on the shoes don't seem to come out far enough, only a few millimeters. My drum is 220mil, the same as my friends N/T but it seems as though my shoes aren't extending far enough to reach the drum. The adjusters are fully extended too. Any help will be appreciated. Thanks |
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| Author: | Bruce [ Sun May 13, 2012 6:41 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
Is not Royce trying to help you on another post? |
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| Author: | mrw82 [ Sun May 13, 2012 6:44 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
jmrc94 wrote: Hello, I need help with the brakes on my '89 Sierra W/T. The handbrake cable appears too long even when fully adjusted. When driving the handbrake lever must be on to make the brake pedal work properly, otherwise it goes to the floor. we put a spacer in the cable the keep tension and now the lever moves only seven clicks but does not work - only makes the pedal brakes work better still. When the handbrake is on the shoes don't seem to come out far enough, only a few millimeters. My drum is 220mil, the same as my friends N/T but it seems as though my shoes aren't extending far enough to reach the drum. The adjusters are fully extended too. Any help will be appreciated. Thanks Have a look here. This fellas having a similar problem. viewtopic.php?f=5&t=32566 |
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| Author: | Bruce [ Sun May 13, 2012 7:01 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
Bwhahahahahaha |
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| Author: | jmrc94 [ Sun May 13, 2012 7:47 pm ] |
| Post subject: | Re: problem with rear brakes on Sierra |
thanks for the link. dont know how i missed that one... |
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