1994 nissan pickup high pitch squeal when driving

u need to buy a new switch

I would check your brake pads to make sure they are good

To address your first problem squeaking brakes aka "brake squeal", is most often casued by one or 2 things: "Pad vibration" or a "low brake warning sensor".

Pad vibation is usually caused by ineffective pad anti-rattling clips & hardware that allow the pads to vibrate at a super fast speed whenever the brakes are applied, thus causing a high pitch brake squeal. To correct this, replace all the pad hardware and anti-rattling clips and make sure you use a quality pad set that has anti-rattling plates attached to the backs of them. Weather conditions do affect brake squeal, that is why it seems to be worse at times.

Low brake warning sensor squeal occurs when your brake pads reach the point of replacement, the sensor attached to the pads scrapes on the rotor which produces a high pitch squealing sound to warn you it's time for new pads.

As far as your second problem goes (a knocking sound), I'll need more information about the problem before I can offer a possible cause (eg. happens on left or right turns, while going over bumps, at high or low speeds, accellerating...).

A high pitch squeal is typically normal. However I have NEVER liked it.

I would replace your brakes with a higher quality brake pad, and see if you still have the problem.


Your pads can squeal when they are getting low, i would also get a second opinion on the condition of the pads.

The high pitch squeal ia most likely the serpentine belt on the front of the engine you can buy some belt dressing from the part store and put it on there and fix that or some soap will work also, the belt may also need to be tightened. As for the egg smell if it smells like eggs it's the catylitic converter doing it's job and is normal, although you should not be able to smell it inside the car when driving you may have an exhaust leak and could be very dangerous carbon monoxide exposure.

Hi,
That squeal could be just the belts, when starting at cold belts tendency is to slip and made some sounds. Check on that in early morning and start your engine and look at your engine to identify the sounds.
The bearing would be in the idler bearing that tightens belt of your aircon compressor.
Hope that helps you out!
Thanks for using Fixya!

Mine has a high pitched whistle at high rpms and I can't figure it out. But mines def not the tranny. I'm thinking it's a vacuum line somewhere. It's a 97 2.3l manual. The colder it is the louder...

sounds like u may have a hole somewhere or maybe turbo aint getting enough oil does it sound like a turbine ?

Inspect the brake rotors for grooving and score marks and also look to see if there are any heat cracks, if there is grooving or very little brake pad material remaining replace the brake pads and also two new rotors, it is also possible that it is just a frozen or stuck brake caliper, this would be indicated by an uneven rotor one that has more metal or meat on one side that the other also uneven brake pads indicates an uneven brake caliper application

have Your alternator belt checked for the propper tension:]