It's easier to work with digits than with pictures of digits
FFAA00 2A 017530 81 FA FFAA21 A2F6 0000 A4 06 Brake Off, Battery Full
FFAA00 32 017530 A1 22 FFAA21 A32F 0000 A6 42 Brake On, Battery Full
FFAA00 DA 017530 89 B2 FFAA21 A34E 0177 C4 F7 9 MPH, Battery Full
FFAA00 D9 017530 8B B3 FFAA21 A34E 0278 C4 F9 15 MPH, Battery Full
Looks like every message starts with FFAA. The next byte might be an address since it is different for send and receive.
I think the last byte in each message is a checksum. The last two sent messages have these differences:
DA 89 B2
D9 8B B3
Note that D9 is 1 lower than DA and 8B is two higher than 89. Add them together and you get B3 being one greater than B2.
The received 0000, 0000, 0177, and 0278 might be speed. In decimal, they are 375 and 632. Divide by 9 and 15 respectively and you get values of 41.66 and 42.13. Call it 42. Divide that number by 42 to get speed in MPH.
Looks like the 6th bit in the last byte before the send checksum might be the brakes.
Compare the values you have with messages with other conditions to see if you can figure out what the other data bytes are doing.