Brake pedal hiss and drops
Discussion
Hi,
I am new to DIY mechanics after completing a very basic evening course at a local College - basic servicing, introduction to brakes etc
My Renault Master MK3 van failed its MOT (UK) on fluctuating front brakes. I removed the brake disks and fitted new ones along with new brake pads and cleaned up the caliper bracket, clips and replaced them and the brake caliper. I did NOT loosen any brake bleed nipples and kept the caliper supported with zip ties around the strut so no unnecessary tension on flexi brake hose. Both sides all fitted back together well and new sensor on nearside brake pad reconnected. The only thing I remember doing slightly wrong was when I went to work back the brake caliper piston on first side I initially forgot to remove\loosten the brake fluid reservoir cap. I then loostened the cap and finished working back the brake caliper
When I put van off axle stands and back on its wheels, the brake pedal now hisses and drops down to floor. There is NO fluid leaks from either front side brakes, there is NO fluid leask from lines from master cyclinder to ABS pump and NO leaks from ABS pump to front wheel brakes, at least that I can see. However, the fluid level in the brake fluid reservoir seems to be right to top when I am sure before it wasn't past the max level
I tried the brake servo test - engine off, I can pump the pedal about 3 times and it is solid and hiss stops. Then start engine and it hisses and pedals goes down slowly to floor.
Is there something else I am missing to fix this or is there a brake servo leak I can find? Otherwise I am assuming its a new brake servo and it is expensive!!!
Thanks in advance
I am new to DIY mechanics after completing a very basic evening course at a local College - basic servicing, introduction to brakes etc
My Renault Master MK3 van failed its MOT (UK) on fluctuating front brakes. I removed the brake disks and fitted new ones along with new brake pads and cleaned up the caliper bracket, clips and replaced them and the brake caliper. I did NOT loosen any brake bleed nipples and kept the caliper supported with zip ties around the strut so no unnecessary tension on flexi brake hose. Both sides all fitted back together well and new sensor on nearside brake pad reconnected. The only thing I remember doing slightly wrong was when I went to work back the brake caliper piston on first side I initially forgot to remove\loosten the brake fluid reservoir cap. I then loostened the cap and finished working back the brake caliper
When I put van off axle stands and back on its wheels, the brake pedal now hisses and drops down to floor. There is NO fluid leaks from either front side brakes, there is NO fluid leask from lines from master cyclinder to ABS pump and NO leaks from ABS pump to front wheel brakes, at least that I can see. However, the fluid level in the brake fluid reservoir seems to be right to top when I am sure before it wasn't past the max level
I tried the brake servo test - engine off, I can pump the pedal about 3 times and it is solid and hiss stops. Then start engine and it hisses and pedals goes down slowly to floor.
Is there something else I am missing to fix this or is there a brake servo leak I can find? Otherwise I am assuming its a new brake servo and it is expensive!!!
Thanks in advance
Gassing Station | Home Mechanics | Top of Page | What's New | My Stuff