My oil pressure light is coming on when I am braking or coasting. It goes off when I am stepping on the gas...but once I am in coast again, it comes back.

Hey Cameron - Usually (Not a Law) it would mean the Caliper is seized. There is a caliper piston - when you press the brake, that piston pushes out, forcing the brake pads to put pressure on the rotor. Your brake fluid is hydraulic fluid - when you take your foot off the brake/it retracts the caliper piston releasing the tension.
There are definitely other things it could possibly be - but if you can get the brake line OFF the caliper housing (attached to the wheel's rotor/where your wheel studs come out of), there will not be any more pressure. I would recommend disconnecting the brake line and applying a penetrant oil to the housing/anywhere you can spray it. (((tip of the day - spray it with brake cleaner first. Douse it. Brake Cleaner - stronger the better - is a very strong solvent - it breaks rust up extremely well, believe it or not - the only downfall is it drys fast - leaving the material open for more corrosion/the remedy - try some brake fluid, let it dry off, then hit it with a good penetrating oil - Get Some, one work search for that. Really effective and non-toxic. Once it's soaked and the brake line is off - leave the caliper in place and see if you can get the piston to go back in enough to get the retaining bolts off and get it off the rotor. E bay is awesome for used parts - but I have a code for Advance Autos coast to coast that isn't advertised that would really help out if you chose to replace new. On some calipers - you can rebuild them (new caliper piston and o-rings that seal the components) but usually a used caliper off of E bay with free shipping is cheaper than the kit. Just an FYI.

Here's the standard procedure (see below).











I've seen a locked caliper more than once. The piston usually gets corrosion in between itself and the cylinder it slids in and out of. Eventually leading to a seized caliper piston either open (when you're lucky) or upon coming to a stop - it will fail to release and go back in. If you get any other information contact me and I'll gladly advise to the best of my ability.

Thanks & All The Best, Justin McCartney

I have a couple of answers for you. First you need to open the f brake fluid container on your car and make sure you have enough fluid becouse the sensor for low fluid is in the container and if it is just a little low it can cause this issue. If it is all the way full then the level switch in the cointainer is bad. There could be one other problem the switch in your emergencie brake is bad.
Second disconect the battery for 30 mins and the maintance light will most likely go off but doing this will reset everything in your car. Clocks, radio everything

If the valve lifters are quiet you most likely have oil pressure even with gauge showing "0".Sounds like the oil pressure switch going bad.I would try that first.

sounds like a problem with the vacuum booster.

In an engine in good condition, oil pressure is a function of RPM. Higher rpm, higher pressure. Whne coasting downhill, in gear, the engine rpm will increase, hence, the oil pressure will go up, as required, and as expected.

There is nothing wrong with your engine, unless the oil pressure goes excessively high under any regime. Low oil pressure is a sign of low rpm, or under load, a sign of worn parts.

Time to see your dealer's service department unless this a feature of the car. Has it always been this way since new? It is shifting itself to first gear which would certainly slow the car down.

Could be your torque converter.
Have you checked all your fluids?
How is your oil Pressure at that speed it should be between 40 and 60
Any Check engine Light?
Does your Abs lights come on?

replace your oil pressure sensor and have a mechanic do a oil pressure test.

Have you checked all the vacuum pipes around the top of the engine.?
It`s not losing oil pressure, it`s just about to stall when the oil light comes on.
Listen for a hissing noise under the hood.
Vacuum leaks can cause real problems with the inlet manifold pressures.
Good luck.

havent seen this problem on any yet. make sure who ever changed the oil used 5W20 the hemis are very picky