Old GM cars back drum brakes sometimes get touchy after the car has set overnight in humid/wet weather. Some Ford rear disc brakes groan when the car is put in gear. This '02 ST8 Sport seems to give a moaning sound from the brakes after it has set overnight or a couple days without moving, but once driven goes away just like the touchy brakes of the GM cars does.

I did a complete brake job on the front (pads were wore to the plates & the rotors shot), but afterwards, the front brakes still moan when the car is put in gear after it sets overnight. (The rears are in good shape, but they moan too). The weather recently has been extremely humid. Just wondering if this is something these cars do, or could mean something else like in the suspension, although the checks I've made show at least the front end to be in good shape.

 

Any brakes on any car might moan if they are not firmly applied. What is an '02 ST8 Sport? Do you mean SRT8 Charger?

 

S type v8 maybe???

 

Even if it is, which one? He just needs to say.

 

Really?

I got the idea from a diecast S-Type that had a license plate on it J ST8.

ST8 Sport = S - Type V8 Sport. Sport. The model with the 17" Sport rims, 235/50ZR17 tires, sport suspension, stiffer seat, no bright metal. Sorry if no one could figure that out!

If people are going to call Supercharged S-Types "STR's"....

I don't think model means anything here. I'm asking if THE BRAND Jaguar are prone to moaning brakes, especially in humid or wet weather, in the same way THE BRAND Jaguar seems to be prone to inferior rubber bushings, and water in the trunk.

 

According to the acronym by-laws...

S-Type Supercharged is STR, but an S-Type V8 referred to as ST8 isn't approved!

I will refer to it as ST8 Sport in private, but here I will painstakingly type out the full name.

Usually I refer to it by the color. I call all my cars by their color. I quit naming them after '60s rock groups back in 1989. I believe Blind Faith, or Blues Image, was the last named vehicle.

 

If you did as below you wouldn't need to say more. And no the brakes don't normally do that as a few searches would show you.

 

I found the definition of the symptom:

creep-groan

It's caused as the brake pedal is slowly released while the engine idles in drive/reverse. Increasing or decreasing pedal efoort can stop the noise. The noise is caused by the pad allowing the disc to slip. Although it has no negative affect on braking, it can be annoying.

To me, it seems humidity may be a factor. Currently, the region has been experiencing 110 to 115 degree heat index, 100% humidity. Shifting into drive at idle with foot on brake produces groaning & moaning from whichever brake feels like doing it at the time. Hopefully it goes away when the weather dries out, otherwise, it's a good reason to sale the car. I mean, I would expect a Yugo to do it.

QUESTION.... I could have swore I posted this in the "General Tech" section. How did it get to the "S-Type" section?

 

St8 means nothing, does it mean the 4l or the 4.2? You say it doesn't matter as your talking about brakes, but the s type uses 2 different parking brake methods depending on year of manufacture, the early type has manual park brake with the latter having electric park brake, the later electric park brake has its own pads and discs and can sometimes fail to disengage and cause brake groan. So if you want help / advice, model, engine size, year and gearbox type are very important, made up fantasy rock band colour names don't help.

 

Still no car details as per below:

 

Huh?

 

He's picked up some crazy ideas.

 

Quote:

Originally Posted by police666

St8 means nothing, does it mean the 4l or the 4.2? You say it doesn't matter as your talking about brakes, but the s type uses 2 different parking brake methods depending on year of manufacture, the early type has manual park brake with the latter having electric park brake, the later electric park brake has its own pads and discs and can sometimes fail to disengage and cause brake groan. So if you want help / advice, model, engine size, year and gearbox type are very important, made up fantasy rock band colour names don't help.

In the initial post of this thread, what year did I say the car was?

How many different size V8's did they put in that year?

All I wanted to know is if these cars (all Jaguars) were prone to groan in high humidity, or wet conditions, or after setting. The context clues were in the first sentence. I mentioned other models that are prone to brake quirks.

This era Jaguar isn't 100% especially different. The calipers on this car are stamped FORD. As are most of the pulleys in the engine & I've also seen FORD #'s on XJ8's & X-Types. I worked at Ford for years, and have owned a Ford for almost 20 years. I know what quality goes into FORD. That's why over here we refer to FORD as "Found On Road Dead", and "Fix Or Repair Daily".

The car groans when put into gear just like my Ford full-size. So, I'm going to assume, a little bit of Ford rubbed off on it on the assembly line.

 

Really?

Don't play like Jaguar isn't prone to problems.

It's in books, on-line, I've seen it on the lots, & even James May on Top Gear UK mentioned the quality of the bushings. Thorley writes in his books about water in the boot & the rubber.

Sorry to say I looked at hundreds of 2002-2006 S & X-Types, XJ8's over 11 months, from every region of USA. I could post some pics of the undercarriages of 10 year old/60,000 mile Jaguars that spent time in the rust belt, but no one wants to see that.

If you own an S or X Type, don't drive it in the salt or in a couple years you won't have rocker panels. And I never would have believed an '04 aluminum & alloy XJ8 could corrode so badly underneath. So, stay away from the salt & keep it in the garage.

The worst thing is book value. You can buy two '03 Supercharged S-Types with 85k on the clock for price of ONE new Corolla. One '05 S-Type R for the same price as a used Chevy Cobalt! What's up with that?

 

I've had brake moan on a wide varety of cars. I don't think it's particularly unusal. In some cases, though, it seems chronic.

If I wanted to I'll bet I could induce some brake moan from most any car just by how I apply the brakes.

Anyhow.....

Since high humidity....something we're very familiar with in westarn Washington.... seems to a factor I's take a good look at the brake rotors in the morning before driving. You might very well find a *very* light rust already forming just from sitting overnight. After a couple brake applications the rotors are swiped clean by the pads.

On my XJR I'll often get a bit of brake noise if the car is left outside over night...but almost never if I keep it in the garage.

We have other variables. Pad composition, rotor finish......and probably many other things that I could think of after another cuppa coffee

Cheers
DD

 

Shhhhhh! Let's not talk about it.

What you refer to as the "worst thing" is actually the "best thing" for many. There are lots of us who love that you can buy used Jags so (relatively) cheaply and would like to keep it that way !

Dollar for dollar you'll never find more car for less money.

Cheers
DD

 

As for bushings (going way off topic here) I don't think it's a quality issue, per se.

Jaguar designers/engineers are....and always have been.... hyper sensitive to NVH and specify bushings with that in mind. I strongly suspect the spec calls for softer material than we'd find on many other cars.

The entirely predictable result is notoriously short bushing life.

This is similar to the situation with many "high performance" tires. Often these tires, although very high quality, give an astonishingly short tread life. Long life simply isn't what they're designed for.

Cheers
DD

 

Are you here to get serious answers to serious questions or just to irritate? The brakes moan no more/no less than other brands. The marque has technical faults just like any other. Does Jaguar not know how to design trunk lids and they all leak? No, in fact it's not the trunk lid at all that leaks on S-types.

 

I was going to approach that. Light rust, or more appropriately, 'flash', on the rotors after it sets overnight outside.

The rears can be making noise due to actual rust build up. The rears have enough pad/rotor so I wasn't planning a rear brake job. The rear rotors have rust on the outer edge, & towards the hub where pad edges are likely contacting. Pads might be glazed also. I may not be able to rid the noise until I change rear brakes.

 

Quote:

Originally Posted by Mikey

Does Jaguar not know how to design trunk lids and they all leak? No, in fact it's not the trunk lid at all that leaks on S-types.

I don't know. You'll have to refer to Technical Bulletin S501-09. The factory wrote it.

Figuring out whether it's a design flaw with the lid, the rubber seals, seams, or anything else may be a waste of time, as MANY an owner (source: on-line search 's-type water in trunk') has tried to solve the problem but hasn't.

So, the main concern might be which type of aquatic life does one choose to keep in the trunk of their Jaguar?

On line searches can yield amazing, yet sad pics of empty aquariums....