They are the 10 inch drum brakes
SOURCE: i need a diagram of rear drum brake assembly of a
Haynes manual should have a breakdown. They run about $20 at the parts store.
there should be several springs. first there are (2) real short springs that hold the shoes to the dust cover/back plate. they go in the center of each shoe. then there is a short spring that goes at the bottom where the adjuster is located. there should be a hole in each shoe. finally there is a long spring that goes at the top where your brake cylinder is and this is what gets attched last after your emergancy brake levers are placed between the shoes .
SOURCE: need Rear Brake Diagram for 1994 Chevy K2500 4x4
Here is the diagram,It is always a good idea to only disaasemble one side so you can use the other side as a reference,I also reccomend using a set od brake pliers,they will the disassembly and reassembly much easier.
SOURCE: 1999 Chevy Tahoe- Soft Brake Pedal
Try having the dealer flush and bleed your system. It is very hard to bleed ABS systems yourself and have safe brakes that still work afterward. Bleeding non-ABS brakes yourself is easy not the same for ABS brakes. Valving, sensors and what-not require a tech and the correct equipment in my opinion. You do it wrong and you could ruin your ABS system. Do that and see if they firm up. I replaced my brake shoes/pads at the same time all new everything in back, drums/springs everything and new rotors up front. then I had the chevy dealer flush, refill and bleed system. Stiffer pedal and brakes work better. Keep in mind the brakes on 99 Tahoes are inaedequate, require new rotors often, heat up and fade/glaze pads regularly. I replace my pads long before they wear down because they glaze up and start fading early. I'll rough em up once maybe, next time, new ones. Every two brake jobs, new rotors for me. Just how it is. They will stiffen a bit and work better but they will never be awesome brakes. Just how it is on 99 and earlier Tahoes. Hope it helps. Very important to bleed correctly though. I'll bleed my 83 Toyota 4x4 myself but not the Tahoe.
SOURCE: S 10 1997 Chevy Blazer brake locking up
Common cause is the drums and brake shoes need to be replaced. When there no longer within the the specification for the brakes to work properly, the self adjusters will over adjust the brake shoes and you'll have the feeling of the rear drum brakes lock up as the shoes will bind up along the drums. Replace both Shoes and Drums and this can be done on your own will common tools and a simple brake spring tool that you can pick up at Auto Zone or Parts Source and both can give you the step by step instructions to replacing the rear brake system. Good luck and be safe.
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