Well, last week i changed my front rotors and brake pads because I was getting some shuddering while braking. THe brake pedal would slighty shake too.

So i replaced that stuff and havent really driven it around alot. So today i get on the highway and slow down because of rush hour traffic. THe shudder is still there! The car also pulls to the left slightly.

I pull off the rotors and pads off to make sure they are seated properly, they were. Put everything back together and still have the problem.

I put on the old rotors which are in good shape, just too thin from getting turned before by the previous owner.

Now the shudder is worse. ANy idea if this could be a caliper sticking?

If one is bad, I will just replace both and be done with it.

How do I go about determining if a caliper is bad? I dont want to start buying parts that wont fix my problem. Also, the car shakes alittle at highway speed. (accelerating or foot off of the gas)

ANy help is very much appreicated!

94 Deville with 131,000 miles

I put the new rotors back on and it still does it.

Im really thinking about just getting two new calipers and putting them in and hopefully be done with the shudder.

try checking the tires have the balance checked and check for bubbles in the tire also.had same problem was the tire needed to be balanced again the weights had fallen off, is your abs light on? maybe sumthing to do with the system.hope this helps u sum
good luck Sal

i looked and didnt see a spot where weights had been. I was thinking that maybe a tire was maybe the cause behind it. was also thinking about putting on the rear tires on the front and see what happens.

just sucks having a car that goes from a fairly smooth ride to a not so smooth ride!

just switched the tires around, no difference.

now to plan B, whatever plan B is.

could the hex bolts on the caliper be the problem? are they supposed to slide freely? Im just trying to go over every single possibility before I start spending lots of time and money.

Well, last week i changed my front rotors and brake pads because I was getting some shuddering while braking. THe brake pedal would slighty shake too.

So i replaced that stuff and havent really driven it around alot. So today i get on the highway and slow down because of rush hour traffic. THe shudder is still there! The car also pulls to the left slightly.

I pull off the rotors and pads off to make sure they are seated properly, they were. Put everything back together and still have the problem.

I put on the old rotors which are in good shape, just too thin from getting turned before by the previous owner.

Now the shudder is worse. ANy idea if this could be a caliper sticking?

If one is bad, I will just replace both and be done with it.

How do I go about determining if a caliper is bad? I dont want to start buying parts that wont fix my problem. Also, the car shakes alittle at highway speed. (accelerating or foot off of the gas)

ANy help is very much appreicated!

94 Deville with 131,000 miles
My dad's '89 Sedan Deville had the same problem, and I changed rotors, pads, and calipers. To see if a caliper is sticking check for even pad wear. On the '89 you have to lube the caliper bolts with disk break lub, inside the sleeve, I have never messed with a '94 but if it is similar to the '89 I lube the bolts.

well i cleaned and lubed the 4 allen bolts/sliders and it made no difference. Now Im thinking about either rebuilding the calipers or just getting some new ones.

could it be the master or anything like that? Brakeline?

Im getting frusterated.:banghead: :drinker

I don't see anything you are doing for the rear discs.

These could also be out of round and causing the shudder.

well, i jacked the car up yet again and looked at the rear brakes, the passenger side i should say.

on one of the pads, its wore down alittle more on one end than it is on the other. I tried to push in the piston with a c-clamp and couldnt press it in. this caliper could be the culpret to the shudder.

whats the best way to release the emergency cable on the caliper? how do you remove that clip? i didnt want to break it so i didnt mess with it too much.

i will look at the drivers side tomarrow.

Matthew, do not try and compress the rear cylinders!!

The only time you need to mess with the rear pistons is when you replace the pads and/or rotors.

With the caliper out of the way take a close look at the end of the piston. It has a "><" shape. You need to either get the proper tool (only a few bucks at most auto stores) or use the handle ends of a pair of pliers, and screw the piston back in untill it bottoms.

Be careful and do not damage the rubber dust boot that protects the piston.

Position the piston as shown in the attached image.

The piston will self adjust, after you put on new pads, with just a few pressings of the brake pedal to reset them.
-George

Matthew, do not try and compress the rear cylinders!!

The only time you need to mess with the rear pistons is when you replace the pads and/or rotors.

With the caliper out of the way take a close look at the end of the piston. It has a "><" shape. You need to either get the proper tool (only a few bucks at most auto stores) or use the handle ends of a pair of pliers, and screw the piston back in untill it bottoms.

Be careful and do not damage the rubber dust boot that protects the piston.

Position the piston as shown in the attached image.

The piston will self adjust, after you put on new pads, with just a few pressings of the brake pedal to reset them.
-George
Thank You!

I hope this doesn't scare you but When I got my 1994 Deville Concours from my grandmother I asked her about any work that she had had done to it. She was telling me about how the brakes would shudder and it was giving her a problem. well she took it in and it ended up being something with the "master cylinder"? in teh rear...or something like that. Either way it ended up costing her like $2,500 to get fixed. I hope this isn't your problem. but I thought I'd let you in on her situation.

Roswell

I got the rears back together and now the braking is so nice and smooth!

Now its on to ordering a kit from bostonsuspension to take care of the ride.

Thanks to any of you that have replied!