Rear brake pad wear
06-03-2005, 04:45 PM
#1
Rennlist Member
Thread Starter
Rear brake pad wear
My brake pad warning light came on last week, so I popped to PCT today on the way home for them to replace the pads...the rear pads were replaced at the last service 7,000 miles ago, so I was expecting it to be needing front pads.
But it was the rears that needed replacing...fronts are still only half worn.
We checked the rear pads (half expecting one of them to be worn more than the others due to sticky piston) but found them to be equally worn.
Bizarre -it means I've gone through a set of rear pads in 7000 miles.
Any ideas why or how?
But it was the rears that needed replacing...fronts are still only half worn.
We checked the rear pads (half expecting one of them to be worn more than the others due to sticky piston) but found them to be equally worn.
Bizarre -it means I've gone through a set of rear pads in 7000 miles.
Any ideas why or how?
06-03-2005, 05:09 PM
#3
Racer
Join Date: Jul 2002
Location: cheshire
Posts: 275
Likes: 0
Received 0 Likes
on
0 Posts
Usually the front brakes take most of the load and wear out faster. If the front brakes are not working then the rears will obviously wear out quick ( 7000 miles is quick) but you should have noticed that the car's nose does not dip on braking. If the fronts are working OK but the rears are jammed on all the time then your fuel consumption should give the game away. Or maybe the garage just forgot to replace the rears at the last service in spite of billing you for it !!
06-03-2005, 05:35 PM
#4
Addict
Rennlist Member
Rennlist Member
One thing I see often in German cars is the brake hoses swell internally. The brakes operate fine, but the lines constrict when the pressure is released. The residual pressure holds the pads against the rotor with just a little too much pressure on them. That could be the cause, or perhaps the fronts have air in them and the rear brakes are doing all the work. The wheels will get hot if the brakes are dragging, but you won't see a big difference in gas mileage.
Did you perhaps get a soft compound on the pads? I recall getting very short life on a set of pads on my early 911, and it was soft compound.
Did you perhaps get a soft compound on the pads? I recall getting very short life on a set of pads on my early 911, and it was soft compound.
06-04-2005, 08:38 PM
#6
Burning Brakes
Join Date: May 2003
Location: N. OC, CA
Posts: 1,060
Likes: 0
Received 0 Likes
on
0 Posts
Same here, front pads last twice as long as rears. In my case, I think it's because of the differences in pad materials. I use Mintex in the front and since there aren't many choices for the 2 piston rears I use OEM pads.
06-06-2005, 03:19 PM
#7
Three Wheelin'
Join Date: Dec 2003
Location: Rancho Palos Verdes CA
Posts: 1,569
Likes: 0
Received 2 Likes
on
2 Posts
Are these the two or four pot rear calipers you have?
I am in the process of switching to the 4 pot later design and the pads are much bigger compared to the 2 pot versions. I wonder why Porsche put the 2 pot calipers on for just the 91 C2's must of got a good deal on them.
I am in the process of switching to the 4 pot later design and the pads are much bigger compared to the 2 pot versions. I wonder why Porsche put the 2 pot calipers on for just the 91 C2's must of got a good deal on them.
Trending Topics
06-06-2005, 07:30 PM
#8
Rennlist Member
Thread Starter
pete000 - mine are the teeny-weeny 2 pot calipers. Have no doubt that I'll be investigating a full brake upgrade (as opposed to just servicing the calipers, chaging the flexible hoses and replacing the brake fluid...)
06-06-2005, 07:44 PM
#9
Burning Brakes
Join Date: May 2003
Location: N. OC, CA
Posts: 1,060
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by robmug
pete000 - mine are the teeny-weeny 2 pot calipers. Have no doubt that I'll be investigating a full brake upgrade (as opposed to just servicing the calipers, chaging the flexible hoses and replacing the brake fluid...)
06-06-2005, 08:09 PM
#11
Burning Brakes
Join Date: May 2003
Location: N. OC, CA
Posts: 1,060
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by robmug
they do the job well enough.
06-06-2005, 11:35 PM
#12
Technical Specialist
Rennlist
Lifetime Member
Rennlist
Lifetime Member
Following up on Springer3's post, the rubber brake hoses are pretty low maintenance, however, the general guideline is to replace them every 10 or so years.
06-07-2005, 08:32 AM
#13
Since we are talking about brakes, can we share what pads we are using? I'm about to replace my fronts and want the best DE compound that can still be used on the street. Not sure I want to do Padgid Oranges again on the street : )
06-07-2005, 02:14 PM
#15
Three Wheelin'
Join Date: Dec 2003
Location: Rancho Palos Verdes CA
Posts: 1,569
Likes: 0
Received 2 Likes
on
2 Posts
FYI, I found that the rear calipers from a 968 or 944 turbo have the same size pistons as the 964 four pot units (easier to find and cheaper). The only thing you have to do is swap the cross over tube and the bleed nipples to make them forward mounting vs the rearward mounting on the 944's. I am still in the process of swapping them out. The bolts were so freaking hard to get loose. so far I have one side done. The pads are the same front to rear on the four pot units (much larger than the little two pot pads). The calipers are the same as the fronts except for the smaller pistons. Also you have to swap out the bias valve to 55 bar. Ordered it from Pelican for 80 bucks. I will post pictures of the whole deal once it is all in.