The Truth About Cars » caliper http://www.thetruthaboutcars.com The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. Thu, 04 Dec 2014 19:13:59 +0000 en-US hourly 1 http://wordpress.org/?v=4.0.1 The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars no The Truth About Cars editors@ttac.com editors@ttac.com (The Truth About Cars) 2006-2009 The Truth About Cars The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars » caliper http://www.thetruthaboutcars.com/wp-content/themes/ttac-theme/images/logo.gif http://www.thetruthaboutcars.com Piston Slap: The Self-Lathing CRX? http://www.thetruthaboutcars.com/2014/08/piston-slap-theres-rub/ http://www.thetruthaboutcars.com/2014/08/piston-slap-theres-rub/#comments Wed, 13 Aug 2014 11:58:45 +0000 http://www.thetruthaboutcars.com/?p=888017 Gareth writes: Good afternoon Sajeev, Read your latest and I’m determined to help you out. I recently had a bone-stock 87 CRX Si follow me home from an impound auction and, if I can get the damn thing through an Ontario Safety Inspection, I’ll let TTAC’s very own Derek K drive it. Therein lies the […]

The post Piston Slap: The Self-Lathing CRX? appeared first on The Truth About Cars.

]]>

photo courtesy: flickr.com

Gareth writes:

Good afternoon Sajeev,

Read your latest and I’m determined to help you out. I recently had a bone-stock 87 CRX Si follow me home from an impound auction and, if I can get the damn thing through an Ontario Safety Inspection, I’ll let TTAC’s very own Derek K drive it.

Therein lies the rub, or brake rub really. The front discs were rubbing, a lot. Constant grinding sound as the wheels turn. I have since removed/lubricated the caliper sliders (they were a bit stuck from sitting) and measured the discs and pads using a measuring tape and straight edge, everything is above min specs.

With the pin lube the grinding noise has abated somewhat but continues, worst is passenger side.

The discs don’t feel warped (no front shudder under hard braking).

Your thoughts?

Sajeev answers:

OMG SON, why can’t someone find ME a nice CRX in Houston?  What’s so wrong with giving the Piston Slap Guy a ride in your whip, huh? I care not of the distance between us, I can still feel the pain inflicted upon me! How could this happen to me?  It must be my fault!

Perhaps less self-loathing and more self-lathing is in order.

Your situation reminds me of an old road test of mine, where the subject’s rear brakes rusted shut waiting for a test drive. Popping them free was fun, actually. That said, I don’t know what’s out-of-place on the CRX.  My gut says that driving more will wipe off the rust/squeaks like a lathe in a machine shop.  Assuming you’ve only driven it a few yards…sorry, meters for you Canadians.

So either replace the discs/pads/calipers now (and flush all the brake fluid) OR drive it slowly another 0.25 to 0.5 miles kilometers to learn more.  This depends on the population density nearby and your faith in this machine. Driving the CRX it will either clear things up or the offending part will come forward as the brakes continue to lathe themselves.

Who knows, it could be a bad hub! But I bet you have rusty/sticky calipers, so flush the brake fluid and put fresh pads/calipers/new or turned rotors on too.

Cheap insurance, totally worth it. Don’t mess with rusty brake systems, DK will appreciate it.

Send your queries to sajeev@thetruthaboutcars.com. Spare no details and ask for a speedy resolution if you’re in a hurry…but be realistic, and use your make/model specific forums instead of TTAC for more timely advice.

The post Piston Slap: The Self-Lathing CRX? appeared first on The Truth About Cars.

]]>
http://www.thetruthaboutcars.com/2014/08/piston-slap-theres-rub/feed/ 23
Piston Slap: An Inappropriate Grab? http://www.thetruthaboutcars.com/2013/01/piston-slap-an-inappropriate-grab/ http://www.thetruthaboutcars.com/2013/01/piston-slap-an-inappropriate-grab/#comments Mon, 14 Jan 2013 12:32:10 +0000 http://www.thetruthaboutcars.com/?p=473537 TTAC Commentator flipper35 writes: Hi Sajeev, We have a 2000 Dodge Durango 2WD with rear abs (hub assembly is different than if the front had abs if it matters) and 165k miles.  It has been a pretty good truck with few issues but we do have an annoying one that came up.  The truck isn’t […]

The post Piston Slap: An Inappropriate Grab? appeared first on The Truth About Cars.

]]>
TTAC Commentator flipper35 writes:

Hi Sajeev,

We have a 2000 Dodge Durango 2WD with rear abs (hub assembly is different than if the front had abs if it matters) and 165k miles.  It has been a pretty good truck with few issues but we do have an annoying one that came up.  The truck isn’t a commuter for me, just for the occasional errand that my wife needs to run or when the whole family goes somewhere so it gets driven a couple times a week just a few miles on the highway into town and back.  The issue is the brakes. 

They work fine but when stopping at highway speeds with constant pressure on the pedal the brakes will suddenly grab more and sometimes it is one side that will grab slightly quicker than the other then the braking is equal again.  These pads have about 8k mile on them and are a ceramic composite pad and were bedded properly when installed but the rotors had some slight grooving and the old one had little life left.  I went with this style because the last set of ceramic composite (NAPA brand) were great with good feel and exceptional performance when hustling on the back roads.  The new ones are from a parts warehouse that supplies parts stores all over the area (dad works there so I got a great discount.  During heavy braking the issue doesn’t show up but it is a little disconcerting to have the truck pull to one side briefly during normal stops.  The brakes will exhibit some fade now when hustling the curvy roads where the old ones did not.  Re-bed or replace pads and rotors?  Rust from sitting a while after the last snow storm and salty roads?

Sajeev answers:

Getting old sucks.  While I am not sure of the exact problem, I betcha it’s one of these:

  • Collapsed brake line (inspect all rubber components)
  • Rusty brake caliper bores (reman replacements are cheap)
  • Crud in the brake caliper’s fluid reservoir (see above)
  • Very, very bad brake fluid (flush the system entirely)
  • Extremely loose ball joint on one side (not likely)

It sounds like you have the brake pad and rotor situation under control, and you drive it enough to make rust a non-starter.  I mean non-stopper.

I think you have an old truck that needs more than a basic brake job. Time to check the calipers, the brake lines and the suspension. Hopefully all you need are a new pair of front calipers: they are about $25 each from Rock Auto. Score.

 

Send your queries to sajeev@thetruthaboutcars.com. Spare no details and ask for a speedy resolution if you’re in a hurry.

The post Piston Slap: An Inappropriate Grab? appeared first on The Truth About Cars.

]]>
http://www.thetruthaboutcars.com/2013/01/piston-slap-an-inappropriate-grab/feed/ 10