2 years ago I bough a second hand Toyota RAV4 2013 LE FWD. When I bough it, the previous owner installed new rotors and brake pads in the front wheels upon my request and practically overflowed the master cylinder with DOT3. It was way above the max indicating line. Soon after I installed new rotors and brake pads in the rear wheels. The brakes felt amazing for more than a year but lately I've been noticing I have to push the pedal deep to be able to get the same effect. I said well, the DOT3 is probably due for replacement and over time it absorbed water. I changed the DOT3 with OEM DOT3 fluid and the fluid I was replacing looked like new. At no moment I saw any rust particles or color change respect to the new fluid. I noticed that the 2 drain valves for the rear calipers had been replaced by new ones. After the change was done I filled the master cylinder to the max indicating line and tested the brakes. They still feel week compared to when the car was bought. I tried braking from 100 km/h to full stop but without stepping on the brake to the max and the car would take 40 to 50 m before stopping. I don't know if this is normal. At no point the tires or brakes emitted any noise. It was a perfectly silent stop. I inspected the calipers for leaks without disassembling them but I couldn't find any. I notice the rotor on the rear right wheel (longest brake line) doesn't show a uniform smooth wear like the others (see larger picture compared to the 2 smaller). Could this mean that this wheel is not braking properly? Its shows a couple of circular grooves. I'm aware that as brake pads begin to wear the brakes in RAV4 could begin feeling spongy (according to some posts I've read in this forum) but I miss the previous braking strength! Also if the car is OFF the brakes are super hard, almost impossible to press, when started in parking the brakes become soft and in forward they turn even softer than in parking (but this could be just an idea of mine)
I would like to ask:
I would like to ask:
- How can I check my master cylinder is not leaking internally.
- How can I check my booster is still good
- Is there anything else like ABS, etc that may need to be checked
- And if it was how dangerous is it not to replace it right away.
- Also what could be the consequences of filling my master cylinder above the max indicating line to see if I can regain some brake strength