Hi, I have noticed this problem with my car lately, where every time I start the car after rains and apply the brakes, the car brakes very hard! I usually do this in the driveway a few times so by the time I hit the road it starts braking fine. Front brakes have been replaced 4 months ago.
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The problem is most likely in the vacuum booster. It has a valve inside when slight pressure is applied to the pedal, applies vacuum boost to the master cylinder aiding the operator in braking. If you notice applying the brakes several times with the engine off, the pedal will harden in the same fashion. With a malfunctioning internal valve the booster can apply the vacuum boost when not needed.
the shudder is from either the front brake rotors or rear brake drums being warped. Probably the rear brake drums. People use the emergency brake as a parking brake, and when the brakes are hot, it warps the drums from the pressure. The "blades" sound is probably the starter ring gear, or the starter itself.
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...).
If you have drum brakes on the rear and I am pretty sure you do, and you had to remove the drums you will need to adjust the rear brakes back to the point of almost touching the drum while jacked up and spinning the tire. Not to tight. The brakes are probably traveling so far to hit the drum that they lock up. This will be more noticeable when raining or damp weather. Hope this helps.
Have you went through rain puddles lately this can cause them to squeal. If this is not your problem then i would set the adjuster on the brakes.... look near the bottom of the brakes for a dial with teeth and turn them downward to set the brakes back a little.... your brakes could be set too close still. Hope this helped ;)
You have a serious vacuum leak affecting the engine and a brake proble, -The connection between them is the brake vacuum assist and the brake master cylinder. The brake master cylinder is the target componant. Change it out and other related problems should be resolved. Good Luck &be safe-Ned
hi im dave
hope i can help
when you had the rear pads applied and the discs turned was there noticeable damage to the disc surface it sounds like your e brake cable is not adjusted properly or perhaps the braided wires inside the insulation are seperating along your brake cable causing the rear brakes to not be adjsting themselves properly. Every time the parking brake is applied the rear brakes are self adjusted if they arent being applied due to slack in or a broken cable you will not adjust your rear brakes. This would accont for the flutter in the brake pedal as hydraulic fluid is still circulating to compress the pads against the rotor but the pads arent reaching the rotor.