drwhosc

Hey everyone. working on my brake calipers, and the scraper rings are really stuck in the calipers. unfortunately my rubber is cracked on one of them, and i have to replace. any tips ?? Hints/ tricks to getting these out. I have a 88S4 so it has the older style metal scraper ring in there

JHowell37

My calipers are from '87 or '88 and have the scraper rings as well. They're driven in just like an oil seal on the back of a wheel hub. There's a shelf they sit on in the caliper to keep them from being driven in too far. When I replaced the pressure seals in my calipers, I left the scraper rings alone. The scraper rings don't do too much as it is. That's why they switched to dust boots on '89+ calipers. Are you planning to replace the rubber pressure seals? That's the critical part in the caliper that can wear out and fail over time.

To remove the scraper just stick a flat head screwdriver between the back of the scraper and the shelf, give it a twist, and it should come out.

drwhosc

Thanks, I got them out. I guess just a bit OCD. I actually cut the rubber seal away, and then there is a shelf on the metal that comes out just a bit. I spill twist of a flat head, and they popped right out. Trying to remove without cutting the rubber with a utility knife was not working well.

Now I will have to figure out how to press them back in. Trying not to split my calipers. I will press them in with a c clamp and some wood.

dr bob

Curious why you are trying not to split the calipers. The crossover lines come off for clean/replate or replace, the bolts come out and can be replaced, and it's much easier to access the bores for refurb. Originally, the bolts are not painted including the exposed small end. The crossover pipe is plated not painted. Disassembly is essential if you want to maintain that originality.

drwhosc

I wish I did split the calipers now. I found that replacing the dust seals (Old Scraper style) is next to impossible not doing so. I just read on this board that you should not split the calipers. OH well I learned my lesson. Bent two scraper rings.

I still have not split the calipers, but when I tried, one of my cross over lines was being difficult, and I am rounding the nut.

Also if folks are reading this in the future, Put your sealing rings in the freezer for about a 1/2 hour really helps with getting the seals into the bore.

the fun continues.

dr bob

The recommendation to not split the calipers has a background assumption that you are driveway hack. The bolts that hold the two halves together are held in with medium Loctite, so the caliper body likes to be heated to soften the bond. Meanwhile, heating opens the aluminum holes while increasing the tension on the bolts. I've found it easiest to heat the caliper in my handy garage toater-oven. While it's hot, bolt the caliper back in place on the car, then pull on the cross-bolts that hold the caliper halves together. I couldn't find a better place to hold the caliper while extracting the through-bolts.

Heating the caliper body is also a Good Idea for removing stubborn bleeder and cross-pipe fittings. Do Not Break The Fittings Off In The Caliper Body. Using good flare-nut wrenches is essential. The crossspipe can be fabricated from store-shelf tubing with a bubble-flaring tool, if you find you need to cut the tubing to get a 6pt socket over the end to get it out. It's a bit of a challenge getting the bends just right, and there's a learning curve with the flaring tool. Good news is that the brakeline tubing is relatively cheap so you can easily fund the learning curve.