When I depress the brake pedal down hard at normal speed, I experience a loss of brake pressure temporarily.
Is the master cylinder leaking internally between primary and secondary?
Thank you for your time.
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Re: Loss of brake pressure
You might check your brake fluid. if it looses preasure than regains it after a second it may be low on fluid allowing air to get into the lines. you might need to blled the breaks to get all the air out of the line. if you need instructions on how to do that let me know.
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It sounds as if you could use a master cylinder and booster replacement. The booster uses vacuum to boost pedal pressure and the choking down of the engine is cause from a vacuum leak. The soft pedal is caused by air in the system or loss of pressure in the main piston seal of the master cylinder.
easy remove vacuum to booster and plug it now go and step on brakes and hold them down hard .if it fades away its the master cylinder .you can do the same test with car off and not touching the booster , if pedal falls its the master cylinder
Long shot: Bad master cylinder - Typically the brake pedal will slowly sink to the floor. On early 2000 vintage Chrysler products you need to check brake lines as they have been known to rust (and fail catastrophically)
if when you push the brake peddle and it is hard at first then starts to fade towards the floor and you have no visible fluid leaks or noticeable fluid loss then your master cylinder is bypassing internally and needs replaced
usually an indicator of either a loss of pressure due to low fluid and/or air in the system (brake fluid leak) or extremely worn rear brakes (if drum brakes in rear). possible causes include master cylinder (internal fluid pressure leak), external fluid leaks (calipers, lines, wheel cylinders), rear drum brakes extremely worn down or severely out of adjustment. normally worn disc brakes may reduce pedal height SOME, but seldom "to floor". but the "mushy" quote combined with the "floor" quote suggests a hydrolic fluid pressure problem.
if you talking brakes not clutch. you can pump the brakes all day long and they don't build pressure and you not losing fluids the master is out. now if you pump them up and they are rock hard your hydrabooster is out.now if your mechanically incline you can order a master cylinder rebuild kit for like 20-30 bucks which is basically orings from local parts store and only tools you need are snapring pliers. or you can change the master ,bench bleed it first then bleed out the rr,lr,rf,lf in that order.hope i help.all under 100 bucks